What are telomeres? The X and Y chromosomes have small regions of homology called pseudoautosomal regions. In most species of animals the sex of individuals is determined decisively at the time of fertilization of the egg, by means of chromosomal Changes in the number or structure of chromosomes in new cells may lead to serious problems.
Only one of the Y chromosome genes, the SRY gene, is responsible for male anatomical traits. See also: Sexual differentiation in humans.
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What is the lewis structure for co2? Wiki User Answered Asked By Wiki User. How many chromosomes are there in a cell? Gametes or sex cells have 23 chromosomes in them because they are half of the body's diploid number In humans, there are 23 chromosomes in each sex cell, since sex cells have half the amount of regular cell chromosomes.
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Congenital adrenal hyperplasia CAH is an inherited autosomal recessive condition that can affect both boys and girls. You are here: Genomic resource centre. Typical sexual development is the result of numerous genes, and mutation in any of these genes can result in partial or complete failure of sex differentiation.
This path to maleness or femaleness originates at the moment of meiosis , when a cell divides to produce gametes , or sex cells having half the normal number of chromosomes. Knowing who has these may help get better and faster treatment.
The other 22 pairs of chromosomes are called autosomes.