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Bob
Wed, Jan-31-07, 06:17
Ok, I know the human male is unique in the species because of
the Y chromosome. Does the Y chromosome also occur in male
primates? Does the male of other animal species have a
similar unique chromosome? I guess what I'm looking for is
how far backward in the evolutionary tree does the Y
chromosome occur? -bob
John Roth
Wed, Jan-31-07, 17:16
On Jan 30, 9:50 pm, "Bob" <bohica...@hotmail.com> wrote:
> Ok, I know the human male is unique in the species because
> of the Y chromosome. Does the Y chromosome also occur in
> male primates? Does the male of other animal species have a
> similar unique chromosome? I guess what I'm looking for is
> how far backward in the evolutionary tree does the Y
> chromosome occur? -bob

All mammals use the X / Y system for sex determination. Birds
have a similar system, based on the W and Z chromosomes. It's
reversed in that the base is male and the sex chromosome
creates a female.

Reptiles and other animals have a wide variety of ways of
determining sex. There are numerous varieties of fish where
sex can change mid- life in response to social cues.

John Roth