Differential diagnosis The physical manifestations of Klinefelter syndrome are often variable. Nucleic Acids Res 37 : D—D For rare diseases, even a small increase in the variance of the liability can have a dramatic effect on disease prevalence. The increase in height is most significant between ages 5 and 8 and results in the mean final height of
Biology Expert. ID: Source: G2C. Related Articles. The eggs fertilized by X-bearing sperm become females XXwhereas those fertilized by Y-bearing sperm become males XY. Most of the Y chromosome genes are involved with essential cell house-keeping activities and sperm production. Share Flipboard Email.
However not all male specific genes are located on the Y chromosome. If the sperm cell contains a Y chromosome, then the resulting zygote will be XY, or male. How many of these chromosomes will be found in an egg cell? However, Stevens is credited for discovering them earlier than Wilson.
The X chromosome, being larger, carries many more genes than does the Y. The zygote is diploidmeaning that it contains two sets of chromosomes. Jewish Virtual Library - Duisburg, Germany. Leave a Reply Cancel reply.
Endocrine features of Klinefelter's syndrome. Their IQ level is in the range of 60—80, with delayed speech and they are at risk for academic, behavioral, and social deficits. Language development Several longitudinal studies of males with 47,XXY have revealed a tendency for language deficits that often causes academic difficulties during the school years.