XX male syndrome (also called de la Chapelle syndrome) is a rare sex chromosomal disorder in men. Usually it is caused by unequal crossing over between X and Y chromosomes during meiosis. The X chromosome is one of the two sex-determining Chromosomes in many animal species including mammals (the other is the Y chromosome) The Y chromosome is the sex-determining Chromosome in most Mammals including Humans In mammals it contains the gene SRY, which triggers In Biology or life science meiosis (pronounced my-oh-sis is a process of reductional division in which the number of chromosomes per cell is cut in half Symptoms include small testes, gynecomastia and sterility. The testicle (from Latin testiculus, diminutive of testis, meaning "witness" virility plural testes) is the male Gynecomastia, or gynaecomastia, ˌgaɪnəkoʊˈmæstiə is the development of abnormally large Mammary glands in Males resulting in breast enlargement which Female infertility|Male infertility Infertility primarily refers to the biological inability of a Man or a Woman to contribute to conception. Many males with this condition also have effeminate characteristics.
Men typically have one X chromosome and one Y chromosome in each diploid cell of their bodies. "Haplo" redirects here For the fictional character see The Death Gate Cycle. Women typically have two X chromosomes. XX males have two X chromosomes, but otherwise appear to be male.
See also
- X chromosome, for other diseases related to the X chromosome. The X chromosome is one of the two sex-determining Chromosomes in many animal species including mammals (the other is the Y chromosome)
References
- de la Chapelle A (1972). "Analytic review: nature and origin of males with XX sex chromosomes". Am J Hum Genet 24 (1): 71–105. PMID 4622299.
External links
The Mendelian Inheritance in Man project is a Database that catalogues all the known Diseases with a genetic component, and—when possible—links themDapyx Software network: MP3 Explorer | Ebook Manager | Zenithic