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Originally Posted by Susan
For this example only...X het Y is the same thing as XY, just written differently. He can give to his offspring either an X or a Y. The woman can only give an X. His offspring can be either XX (a girl) or XY (a boy).
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Another question. Isn't it "ZW" in reptiles - where a female is ZW (and can produce male or female offspring) and males are ZZ (and can only contribute the needed Z to make either gender)?