From Peter Finch
finch@bcs.org.uk
Whether young persons should be advised to look to the birds and the bees for
sexual enlightenment takes on a new dimension in your article on sex chromosomes
in birds
(This Week, 18 October, p 12).
I knew that bees have a different sex chromosome arrangement than our XX
(female) and XY (male). Now I discover that birds have ZZ (male)and ZW (female)
arrangement.
How far back must we go to find a common ancestor? What was its sex
chromosome arrangement?
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