While it is true that whether the male contributes an X or a Y chromosome determines the sex of the resulting embryo, it is well-known that the bitch's hormonal levels may determine whether it is easier for one or the other to penetrate the egg, meaning both the dog and the bitch have a role in determining the ultimate sex of the embryos. Not only that, but sex ratios vary among breeds of dogs as well, so it may be that some breeds tend to have higher hormones at the time of conception than others. Bottom line is that if you are asked the question on a test, the answer is that the male determines the sex. But it really isn't that simple. Leanne
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