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oldcollegelady oldcollegelady
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14 years ago
I was told that genes or alleles are pretty much in the same loci on each chromosome, example- the gene for eye color (I know there is more than one for eye color) is at the same location on each chromosome -say on the tippy top. The X and Y chromosomes differ in one way and that is the Y chromosome has the "sex determining gene" on it somewhere. But is everything pretty much the same with respect to the location of genes on the X and Y chromosomes? If the gene or allele for eye color on the tippy top of the X, would it be on the tippy top of the Y. thanks
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wrote...
Educator
14 years ago
Yep, but there are only 9 genes that fit this criteria. These genes are called pseudoautosomal because they are inherited just like any autosomal genes. Males have two copies of these genes: one in the pseudoautosomal region of their Y, the other in the corresponding portion of their X chromosome. So males can inherit an allele originally present on the X chromosome of their father and females can inherit an allele originally present on the Y chromosome of their father. The other genes on the Y chromosome, outside the pseudoautosomal region, encode proteins that appear to function only in the testes.
wrote...
14 years ago
thanks, that is interesting.
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