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There are communities in Spain and also Pennsylvania where polydactyly is a common trait. why does this tend to be passed on from generation to generation?
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There are communities in Spain and also Pennsylvania where polydactyly is a common trait. why does this tend to be passed on from generation to generation?

User Steven Behnke
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It is freely passed along through the population, and because it is dominant, it continues to show up in offspring frequently enough that it never disappears.
User Samuelabate
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