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mammalian placentas have the genes of both parents. The mother s side of the placenta contains her genes but on the embryo s side are paternally imprinted causing what animal breeders call the Paternal Grandsire Effect causing certain traits to skip a generation.

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Fun Fact: mammalian placentas have the genes of both parents. The mother’s side of the placenta contains her genes but on the embryo’s side are paternally imprinted causing what animal breeders call the “Paternal Grandsire Effect” causing certain traits to skip a generation.

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vet.cornell.edu

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