| 作者 |
 很久不来了，这里还是这么热闹，知道这里高人多，想咨询个关于染色体的问题，先谢过！ |
 |
| 所跟贴 |
很久不来了，这里还是这么热闹，知道这里高人多，想咨询个关于染色体的问题，先谢过！ -- emy - (167 Byte) 2006-11-22 周三, 17:22 (1036 reads) |
追忆似水流年
头衔: 海归少校
加入时间: 2005/04/26
文章: 90
海归分: 12545
|
|
|
作者：追忆似水流年 在 海归酒吧 发贴, 来自【海归网】 http://www.haiguinet.com
现在有个神奇的万事通,包打听,叫google.......
What is 47,XYY syndrome?
47,XYY syndrome is characterized by an extra copy of the Y chromosome in each of a male's cells. Most often, this chromosomal change causes no unusual physical features or medical problems. Males with 47,XYY syndrome are sometimes taller than average and have an increased risk of learning disabilities and delayed speech and language skills. Developmental delays and behavioral problems are also possible, but these characteristics vary widely among affected boys and men. Most males with 47,XYY syndrome have normal sexual development and are able to conceive children.
How common is 47,XYY syndrome?
About 1 in 1,000 males is born with an extra copy of the Y chromosome in each cell. Five to 10 boys with 47,XYY syndrome are born in the United States each day.
What are the genetic changes related to 47,XYY syndrome?
47,XYY syndrome is a chromosomal condition related to the Y chromosome.
People normally have 46 chromosomes in each cell. Two of the 46 chromosomes are sex chromosomes, called X and Y. Females have two X chromosomes (46,XX), and males have one X chromosome and one Y chromosome (46,XY).
47,XYY syndrome is caused by the presence of an extra copy of the Y chromosome in each of a male's cells. As a result of the extra Y chromosome, each cell has a total of 47 chromosomes instead of 46. It remains uncertain why an extra copy of the Y chromosome is associated with tall stature and learning problems in some boys and men.
Some males with 47,XYY syndrome have an extra Y chromosome in only some of their cells. These cases are called 46,XY/47,XYY mosaics.
Can 47,XYY syndrome be inherited?
47,XYY syndrome usually is not inherited, but occurs as a random event during the formation of sperm cells. An error in cell division called nondisjunction can result in sperm cells with an extra copy of the Y chromosome. If one of these atypical reproductive cells contributes to the genetic makeup of a child, the child will have an extra Y chromosome in each of the body's cells.
In some cases, the addition of an extra Y chromosome results from nondisjunction during cell division in early embryonic development. These cases are usually 46,XY/47,XYY mosaics.
Where can I find information about treatment for 47,XYY syndrome?
You might find information on treatment of 47,XYY syndrome in Educational resources and Patient support.
Where can I find additional information about 47,XYY syndrome?
You may find the following resources about 47,XYY syndrome helpful. These materials are written for the general public.
*
MedlinePlus - Health information (2 links)
*
Educational resources - Information pages (6 links)
*
Patient support - For patients and families (3 links)
You may also be interested in these resources, which are designed for healthcare professionals and researchers.
* PubMedThis link leads to a site outside Genetics Home Reference. - Recent literature
What other names do people use for 47,XYY syndrome?
* XYY Karyotype
* XYY syndrome
* YY syndrome
See How are genetic conditions and genes named? in the Handbook.
What if I still have specific questions about 47,XYY syndrome?
* See How can I find a genetics professional in my area? in the Handbook.
* Ask the Genetic and Rare Diseases Information CenterThis link leads to a site outside Genetics Home Reference..
* Submit your question to Ask the GeneticistThis link leads to a site outside Genetics Home Reference..
Where can I find general information about genetic conditions?
The Handbook provides basic information about genetics in clear language.
* What does it mean if a disorder seems to run in my family?
* What is a chromosome?
* Can changes in chromosomes affect health and development?
* Are chromosomal disorders inherited?
These links provide additional genetics resources that may be useful.
* Genetics and health
* Resources for Patients and Families
* Resources for Health Professionals
What glossary definitions help with understanding 47,XYY syndrome?
atypical ; cell ; cell division ; chromosome ; developmental delay ; embryonic ; karyotype ; learning disability ; mosaic ; nondisjunction ; reproductive cells ; sex chromosomes ; sperm ; stature ; syndrome
You may find definitions for these and many other terms in the Genetics Home Reference Glossary
作者：追忆似水流年 在 海归酒吧 发贴, 来自【海归网】 http://www.haiguinet.com
|
|
|
| 返回顶端 |
|
 |
|
| |
|
|
|
您不能在本论坛发表新主题, 不能回复主题, 不能编辑自己的文章, 不能删除自己的文章, 不能发表投票, 您 不可以 发表活动帖子在本论坛, 不能添加附件可以下载文件, |
|
|
