41. Klinefelter Syndrome klinefelter syndrome occurs in 1 in 500 to 1 in 1000 live births. Men and boys with klinefelter syndrome have aY chromosome and 2 X chromosomes. http://gslc.genetics.utah.edu/units/disorders/karyotype/klinefelter.cfm

Genetic Science Learning Center at The University of Utah Home About Us Feedback ... What Can Our Chromosomes Tell Us? Klinefelter Syndrome Klinefelter Syndrome Klinefelter Syndrome occurs in 1 in 500 to 1 in 1000 live births. People with this disorder develop as males with subtle characteristics that become apparent during puberty. They are often tall and usually do not develop secondary sex characteristics such as facial hair, or underarm and pubic hair. Men and boys with Klinefelter Syndrome have a Y chromosome and 2 X chromosomes. This is an example of trisomy Where does the extra chromosome come from? In about half of Kleinfelter cases, the extra X chromosome is from the mother's egg, while in the other half of cases the extra chromosome is from the father's sperm. Additional Resources Klinefelter Syndrome and Associates Turner Center If you are having problems with an animation on this page you may need to download the latest version of the Macromedia Flash player

42. Klinefelter Syndrome klinefelter syndrome (or XXY syndrome) is a chromosome disorder that affects males. The affected male has an additional X chromosome, which causes http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/Klinefelter_syndr

43. Klinefelter's Syndrome: Definition And Much More From Answers.com klinefelter syndrome What is klinefelter syndrome? In 1942, Harry Klinefelter, Fuller Albright, and their coworkers at the Massachusetts General. http://www.answers.com/topic/klinefelter-s-syndrome

showHide_TellMeAbout2('false'); Business Entertainment Games Health ... More... On this page: Diagnosis Medical WordNet Wikipedia Mentioned In Or search: - The Web - Images - News - Blogs - Shopping Klinefelter's syndrome Diagnosis Klinefelter Syndrome What is Klinefelter syndrome? In 1942, Harry Klinefelter, Fuller Albright, and their coworkers at the Massachusetts General Hospital published a report about 9 men who had enlarged breasts, sparse facial and body hair, small testes, and the inability to produce sperm. This combination of features has come to be recognized as Klinefelter syndrome. What causes Klinefelter syndrome? Klinefelter syndrome is caused by the presence of an extra sex chromosome. Males with the syndrome have a sex chromosome composition of XXY instead of the usual XY male sex chromosome complement. What is XXY? Chromosomes are carriers of DNA, the hereditary material. The chromosomes are visible under an ordinary light microscope. Men and women usually have 2 sex chromosomes. Women inherit 2 X chromosomes, one from each parent. Men inherit an X chromosome from their mother and a Y chromosome from their father. Males with Klinefelter syndrome usually have an additional X chromosome for a total of three sex chromosomes two X chromosomes and one Y chromosome.

44. Klinefelter Syndrome National network. 4 affiliated groups. Founded 1990. Mission is to educate, encourage research and foster http://my.webmd.com/hw/raising_a_family/shc29kln.asp

var guid_source = ""; var guid_source_id = ""; //unused var encodedurl = ""; WebMD Today Home WebMD News Center XML News via RSS Member Services WebMD University My WebMD Find a Physician Medical Info Check Symptoms Medical Library Health Tools Clinical Trials ... Women, Men, Lifestyle Who We Are About WebMD Site Map Health Topics Symptoms ... Klinefelter Syndrome Support Group Klinefelter Syndrome Klinefelter Syndrome and Associates National network. 4 affiliated groups. Founded 1990. Mission is to educate, encourage research and foster treatment and cures for symptoms of sex chromosome variations. These include, but are not limited to, XXY, XXX, XYY, XXXY, XXXXXY, XXYY, etc. Brochures are available that describe basic symptoms, diagnoses and treatments. Newsletter ($25/USA; $27/Canada; $30/Int'l) (US funds). WRITE: 11 Keatz Court Coto de Caza, CA 92679 CALL: 1-888-999-9428 WEBSITE: http://www.genetic.org/ks VERIFIED: 10/20/2004 Klinefelter Syndrome Support Group Online. Offers online support group information. Provides e-mail list to chat with others, information on variations of the disorder, conferences and information on local support group meetings. WEBSITE: http://klinefeltersyndrome.org

45. Klinefelter Syndrome CHC Wausau Hospital s Medical Library and Patient Education Center provides research services and healthcare information to physicians, http://www.chclibrary.org/micromed/00054060.html

Main Search Index Definition Description Causes ... Resources Klinefelter syndrome Definition Klinfelter syndrome is a genetic disorder affecting males. People with this syndrome are born with at least one extra X chromosome. Description Chromosomes are found in every cell in the body. Chromosomes contain genes, structures that direct the growth and functioning of all the cells and systems in the body. In other words, chromosomes are responsible for passing on hereditary traits from parents to child, like eye color, height, nose shape, etc. Chromosomes also determine whether the child will be male or female. Normally, a person has a total of 46 chromosomes in each cell, two of which are responsible for determining that individual's sex. These two sex chromosomes are called X and Y. The combination of these two types of chromosomes determines the sex of a child. Females have two X chromosomes (the XX combination); males have one X and one Y chromosome (the XY combination). In Klinefelter syndrome, a problem very early in development results in an abnormal number and arrangement of chromosomes. Most commonly, a male with Klinefelter syndrome will be born with 47 chromosomes in each cell, rather than the normal number of 46. The extra chromosome is an X chromosome. This means that rather than having the normal XY combination, the male has an XXY combination. Some Klinefelter patients have more complex chromosomal errors, including the presence of 48, 49, or even 50 chromosomes. All of the extra chromosomes are Xs.

46. THE MERCK MANUAL--SECOND HOME EDITION, Klinefelter Syndrome In Ch. 266, Chromoso klinefelter syndrome is a disorder in which male infants are born with an extra X klinefelter syndrome is relatively common. Most boys with Klinefelter http://www.merck.com/mmhe/sec23/ch266/ch266g.html

var externalLinkWarning = "The link you have selected will take you to a site outside Merck and The Merck Manuals.*n*nThe Merck Manuals do not review or control the content of any non-Merck site. The Merck Manuals do not endorse and are not responsible for the accuracy, content, practices, or standards of any non-Merck sources."; Search The Second Home Edition , Online Version Search Index A B C D ... Z Sections Accidents and Injuries Blood Disorders Bone, Joint, and Muscle Disorders Brain, Spinal Cord, and Nerve Disorders ... Women's Health Issues Resources Anatomical Drawings Multimedia Pronunciations Weights and Measures ... , Online Version Section Children's Health Issues Chapter Chromosomal and Genetic Abnormalities Topics Introduction Down Syndrome Fragile X Syndrome Klinefelter Syndrome Long QT Syndrome Noonan Syndrome Triple X Syndrome Turner Syndrome ... XYY Syndrome Klinefelter Syndrome Buy The Book Print This Topic Email This Topic Pronunciations diabetes mellitus gynecomastia hypothyroidism Klinefelter syndrome is a disorder in which male infants are born with an extra X chromosome (XXY). Klinefelter syndrome is relatively common. Most boys with Klinefelter syndrome have normal or slightly decreased intelligence. Many have speech and reading disabilities and difficulties with planning. Most have problems with language skills. Early problems with language may lead to problems with social interactions that affect behavior, and these children often get into trouble at school. Although their physical characteristics can vary greatly, most are tall with long arms but otherwise normal in appearance.

47. MedlinePlus: Klinefelter's Syndrome Genetics; Genetics Home Reference klinefelter syndrome (National Library of Medicine) Information from the Medical Encyclopedia; Klinefelter s Syndrome http://www.nlm.nih.gov/medlineplus/klinefelterssyndrome.html

@import url(http://www.nlm.nih.gov/medlineplus/images/advanced.css); Skip navigation Other health topics: A B C D ... List of All Topics Klinefelter's Syndrome Contents of this page: From the NIH Diagnosis/Symptoms Genetics Organizations ... Information from the Medical Encyclopedia Search MEDLINE/PubMed for recent research articles on Klinefelter's Syndrome You may also be interested in these MedlinePlus related pages: Genetics/Birth Defects Men's Health From the National Institutes of Health Understanding Klinefelter Syndrome: A Guide for XXY Males and their Families (National Institute of Child Health and Human Development) Diagnosis/Symptoms Testosterone Test (American Association for Clinical Chemistry) Specific Conditions Patient's Guide to Low Testosterone (Endocrine Society, Hormone Foundation) Sex Chromosome Variations: About 47XXY (Klinefelter Syndrome and Associates) Clinical Trials ClinicalTrials.gov: Klinefelter Syndrome (National Institutes of Health) Genetics Genetics Home Reference: Klinefelter syndrome (National Library of Medicine) Chromosomal Abnormalities (March of Dimes Birth Defects Foundation) Also available in: Spanish Organizations Klinefelter Syndrome and Associates National Institute of Child Health and Human Development Teenagers Delayed Puberty (Nemours Foundation) Information from the Medical Encyclopedia Klinefelter's Syndrome Select services and providers for Klinefelter's Syndrome in your area.

48. MedlinePlus Medical Encyclopedia: Klinefelter Syndrome 47 XXY syndrome. Definition Return to top. klinefelter syndrome is a condition that occurs in men as a result of an extra X chromosome. http://www.nlm.nih.gov/medlineplus/ency/article/000382.htm

@import url(/medlineplus/images/advanced.css); Skip navigation Medical Encyclopedia Other encyclopedia topics: A-Ag Ah-Ap Aq-Az B-Bk ... Z Klinefelter syndrome Contents of this page: Alternative names Definition Causes, incidence, and risk factors Signs and tests ... Calling your health care provider Alternative names 47 X-X-Y syndrome Definition Return to top Klinefelter syndrome is a condition that occurs in men as a result of an extra X chromosome. The most common symptom is infertility. Causes, incidence, and risk factors Return to top Humans have 46 chromosomes, which contain all of a person’s genes and DNA. Two of these chromosomes, the sex chromosomes, determine a person’s gender. Both of the sex chromosomes in females are called X chromosomes. (This is written as XX.) Males have an X and a Y chromosome (written as XY). The two sex chromosomes help a person develop fertility and the sexual characteristics of their gender. Klinefelter syndrome results in males who have at least one extra X chromosome. Usually, this occurs as a result of one extra X (written as XXY). Klinefelter syndrome is found in about 1 out of every 500-1,000 newborn males. Women who have pregnancies after age 35 are slightly more likely to have a boy with this syndrome than younger women.

49. KLINEFELTER SYNDROME : Contact A Family - For Families With Disabled Children: I Contact a Family is a UK charity for families with disabled children. We offer information on specific conditions and rare disorders. http://www.cafamily.org.uk/Direct/k18.html

printer friendly KLINEFELTER SYNDROME home how we can help medical information index of conditions ... how you can help Did you find this page helpful? yes no Klinefelter syndrome: XXY syndrome (XXXY and XXXXY are sometimes included) This syndrome occurs only in males and is due to a chromosomal abnormality.A chromosome is a rod-like structure present in the nucleus of all body cells, with the exception of the red blood cells, and which stores genetic information. Normally humans have 23 pairs of chromosomes, the unfertilised ova and each sperm carrying a set of 23 chromosomes. On fertilisation the chromosomes combine to give a total of 46 (23 pairs). A normal female has an XX pair and a normal male an XY pair. The male affected by Klinefelter syndrome has two X chromosomes, as well as one Y, resulting in the formation XXY. A mosaic form also occurs where only a percentage of body cells contain XXY while the remainder carry XY. The extent of the affect will depend upon the proportion of XXY to XY throughout the body. There is an enormous variation in the expression of this condition. Some men are entirely normal and the diagnosis is only made for an incidental reason. It is important to give an open diagnosis to such children and not just paint a picture of the 'full blown' condition which is described below. It may be that just some of the features are present, such as tall stature or delayed puberty.

50. Klinefelter Syndrome - Keep Kids Healthy A discussion of the klinefelter syndrome, a cause of mental retardation and delayed puberty in children with an extra X chromosome. http://www.keepkidshealthy.com/welcome/conditions/klinefelter.html

Bookstore Site Map Contact Us Help ... What's New? Search this site: Advanced Search Main Menu Useful Tools Index of Topics Pediatric Problems Parenting Tips ... Web Links Online Resources What's New Reviews Growth Charts Online Forums ... Height Calculator Newsletters: Subscribe to get free news, tips and updates. Recommend Us tell a friend about us or email this page to a friend Main Diseases and Conditions Klinefelter Syndrome Boys normally have 46 chromosomes, including one X and one Y chromosome (46, XY). Girls also have 46 chromosomes, including two X chromosomes (46, XX). Related Topics Gynecomastia School Performance Children with Klinefelter syndrome have one or more extra X chromosomes. It occurs in about 1 out of every 1000 newborn males, and most of these children will have a chromosome complement equal to 47, XXY , although other patterns also exist. Since you must have a Y chromosome to have this disorder, it affects only males. The symptoms of Klinefelters may include a typical body appearance, being tall (taller than average compared to other family members) and usually underweight . They may also have long legs

51. © The Centre For Genetics Education klinefelter syndrome is the name given to a condition in which there is a Boys with klinefelter syndrome have a 47,XXY chromosome complement. http://www.genetics.com.au/factsheet/30.htm

Genes and Chromosomes Changes to the Genetic Code When Genes are Faulty - Mutations Genetic Conditions Genetic Counselling Autosomal Recessive Inheritance Autosomal Dominant Inheritance X-Linked Inheritance X-Inactivation Genetics and the Evironment - Multifactorial Inheritance Mitochondrial Inheritance Changes in Chromosomes - Number or Size Changes in Chromosomes - Translocations Genetic Imprinting Prenatal Testing Preimplantation Genetic Diagnosis Prevention of a Genetic Condition - Folate Before Pregnancy Newborn Screening for Genetic Disorders Genetic Testing and Screening - Medical Applications Genetic Testing and Screening - Forensic and Other Applications Ethical Issues in Human Genetics The Human Genome Project Pharmacogenetics Cloning Gene Therapy When Parents are Related - Consanguinity Trisomy 21 - Down Syndrome Trisomy 13 Trisomy 18 Klinefelter Syndrome Turner Syndrome Fragile X Syndrome Cystic Fibrosis Thalassaemia Tay-Sachs Disease Haemochromatosis Huntington Disease Haemophilia Muscular Dystrophy - Duchenne and Becker Neurofibromatosis Type I Neurofibromatosis Type II Familial Hypercholesterolaemia and Cardiovascular Disease Short Stature and Other Skeletal Dysplasias Genetics and Cancer Breast and Ovarian Cancer - Genetic Aspects Bowel Cancer - Genetic Aspects Melanoma - Genetic Aspects Cardiac Disease - Genetic Aspects Diabetes Type 1 and Type 2 - Genetic Aspects Mental Illness - Schizophrenia and Manic Depression - Genetic Aspects Alzheimer Disease - Genetic Aspects Neural Tube Defects - Spina Bifida and Anencephaly

52. The Klinefelter Syndrome And Associates Has Moved As Of January 1 The klinefelter syndrome and Associates has moved as of January 1, 1997 to their very own domain at. WWW.GENETIC.ORG. Click on the link above to go there http://www.medhelp.org/web/ks.htm

The Klinefelter Syndrome and Associates has moved as of January 1, 1997 to their very own domain at: WWW.GENETIC.ORG Click on the link above to go there and then please update your bookmarks! Thanks Med Help for the lift!

53. Klinefelter Syndrome klinefelter syndrome Updated April 15, 2005 klinefelter syndrome XXY New South Wales Genetics Program, Australia; Sex Chromosome Problems Discovered http://www.noah-health.org/en/genetic/conditions/klinefelter.html

Skip navigation About NOAH Help English Spanish Both Advanced NOAH Genetic Diseases Change text size: Klinefelter Syndrome Updated: April 15, 2005 About 47XXY/Klinefelter Syndrome American Association for Klinefelter Syndrome Information and Support (AAKSIS) Chromosomal Abnormalities March of Dimes Klinefelter Syndrome Government of Victoria, Australia Klinefelter Syndrome Merck Manual, 2nd Home Edition Klinefelter Syndrome: XXY New South Wales Genetics Program, Australia Sex Chromosome Problems Discovered through Prenatal Diagnosis: Klinefelter Syndrome Pacific Northwest Regional Genetics Group (also in Spanish Sex Chromosome Variations: About 47XXY Klinefelters Syndrome and Associates Understanding Klinefelter Syndrome: A Guide for XXY Males and Their Families National Institute of Child Health and Development What to Expect; How to Respond American Association for Klinefelter Syndrome Information and Support Researched by NOAH Contributing Editor: NOAH Team NOAH Genetic Diseases Specific Conditions > Klinefelter Syndrome Health Topics Index A to Z Page of the Month Advanced Search ... Feedback

54. Search Result For "Klinefelter Syndrome" About 47XXY/klinefelter syndrome; Chromosomal Abnormalities; klinefelter syndrome; klinefelter syndrome; klinefelter syndrome XXY; Sex Chromosome Problems http://www.noah-health.org/search/results.php?lang=1&keyword=Klinefelter Syndrom

55. Klinefelter Syndrome Definition - Medical Dictionary Definitions Of Popular Medi Online Medical Dictionary and glossary with medical definitions. http://www.medterms.com/script/main/art.asp?articlekey=4111

56. Special Child: Disorder Zone Archives - Klinefelter Syndrome klinefelter syndrome (KS) is a genetic disorder that is thought to be the most common chromosomal variation found in humans, with an occurrence rate of 1 in http://www.specialchild.com/archives/dz-032.html

Disorder Zone Archives Klinefelter Syndrome Introduction Klinefelter syndrome (KS) is a genetic disorder that is thought to be the most common chromosomal variation found in humans, with an occurrence rate of 1 in every 500 to 1,000 live born males. KS, which is found exclusively in males, is caused by a variation in the sex chromosomes, resulting in a hormone imbalance. KS occurs when a male has an extra X chromosome. That is, instead of having the typical 46 chromosomes, males with KS have 47 (typical males are classified as 46, XY, where they inherit the X chromosome from their mother and the Y chromosome from their father; males with KS are 47, XXY). The extra chromosome can be inherited from either the mother or the father, however, advanced maternal age does increase the risk slightly of having a child with XXY. KS was first described in 1942 by Dr. Harry Klinefelter and coworkers at Massachusetts General Hospital in Boston. In the late 1950's it was then revealed by other researchers that the cause of KS was due to an extra X chromosome. Features and Characteristics Not all males with XXY actually develop the syndrome (or its symptoms and characteristics). In fact, many males show no abnormalities at all. However, for those who have developed KS, the following characteristics have been identified:

57. Klinefelter Syndrome Medical Information klinefelter syndrome Information from Drugs.com. klinefelter syndrome is a condition that occurs in men as a result of an extra X chromosome. http://www.drugs.com/enc/klinefelter_syndrome.html

Home New Drugs Latest News Drug Interactions ... Forum Drugs.com - prescription drug and medicine information available on over 24,000 approved- medications and pharmaceuticals, including side effects and drug interactions. Log-in Register Advertisement Buy a Link Now Special Offers From our sponsors Categories Diabetes Gastro Center Weight Loss AIDS/HIV ... Sexual Health Advertisement Advanced Search Or click the first letter of a drug name: A B C D ... Z Klinefelter syndrome Injury Disease Nutrition Poison ... Z Klinefelter syndrome Definition Klinefelter syndrome is a condition that occurs in men as a result of an extra X chromosome. The most common symptom is infertility. Alternative Names 47 X-X-Y syndrome Causes Humans have 46 chromosomes, which contain all of a person's genes and DNA. Two of these chromosomes, the sex chromosomes, determine a person's gender. Both of the sex chromosomes in females are called X chromosomes. (This is written as XX.) Males have an X and a Y chromosome (written as XY). The two sex chromosomes help a person develop fertility and the sexual characteristics of their gender. Klinefelter syndrome results in males who have at least one extra X chromosome. Usually, this occurs as a result of one extra X (written as XXY).

58. AllRefer Health - Klinefelter Syndrome (47 X-X-Y Syndrome) klinefelter syndrome (47 XXY Syndrome) information center covers causes, prevention, symptoms, diagnosis, treatment, incidence, risk factors, signs, tests, http://health.allrefer.com/health/klinefelter-syndrome-info.html

AllRefer Channels :: Yellow Pages Reference Health Home ... Contact Us Quick Jump ADD/ADHD Allergies Alzheimer's Disease Arthritis Asthma Back Pain Breast Cancer Cancer Colon Cancer Depression Diabetes Gallbladder Disease Heart Attack Hepatitis High Cholesterol HIV/AIDS Hypertension Lung Cancer Menopause Migraines/Headaches Osteoporosis Pneumonia Prostate Cancer SARS Stroke Urinary Tract Infection 1600+ More Conditions Alternative Medicine Health News Symptoms Guide Special Topics ... Medical Encyclopedia Web health.allrefer.com You are here : AllRefer.com Health Klinefelter Syndrome Klinefelter Syndrome Definition Treatment Expectations or Prognosis Complications ... Go To Main Page Alternate Names : 47 X-X-Y Syndrome Definition Klinefelter syndrome is a chromosome abnormality that affects only men and causes hypogonadism A person's sex is determined by the X and Y chromosomes. Normally, men have an X and a Y and women have two X's. In Klinefelter syndrome, a male has two X's and a Y. The condition is common and affects 1 in 500 men. The infant appears normal at birth, but the defect usually becomes apparent in puberty when secondary sexual characteristics fail to develop (or develop late). At this time, testicular changes occur that eventually result in infertility in the majority of those affected. Some mild cases may go undetected, with no abnormalities present except infertility.

59. Klinefelter Syndrome Top / Health / Conditions and Diseases / Genetic Disorders / klinefelter syndrome. klinefelter syndrome Support Educational and support information about http://www.reference.com/Dir/Health/Conditions_and_Diseases/Genetic_Disorders/Kl

Dictionary Thesaurus Encyclopedia Web Home Premium: Sign up Login YOUR AD HERE Dictionary ... Encyclopedia - Web Directory Web Directory Top Health Conditions and Diseases Genetic Disorders / Klinefelter Syndrome Klinefelter Syndrome Support Educational and support information about Klinefelter Syndrome/XXY and its variants. XXY List Member's Home Page This is the XXY's List Member's Hame Page - meet other XXY's and join a listserv to meet others. This is a private dicussion list of which you MUST be an XXY to subscribe. Gynecomastia and Klinefelter's Syndrome - Surgical Correction Explore male breast reduction (gynecomastia) found in Klinefelter's Syndrome with surgical reduction by excision and liposuction. Many pages with before and after photographs, links, movies, and patient question and answer boards. Understanding Klinefelter Syndrome Also known as "XXY males" these persons have an extra sex chromosome, XXY instead of the usual male arrangement, XY. Many men go through life without any symptoms or knowledge of this genetic difference. This site explains causes, symptoms, treatments and resources. XXY, Variants and Klinefelter Syndrome. Information and letters from other parents and men who are XXY or a variant.

60. Klinefelter Syndrome klinefelter syndrome (KS) is a disorder that occurs in some men who have more than one X The most common findings in males with klinefelter syndrome are http://healthgate.partners.org/browsing/browseContent.asp?fileName=11722.xml&tit

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