Question 42 • Environmental Science A
Polydactylism, having extra fingers or toes, is an inherited trait that occurs in different populations. Its frequency can be higher in some groups because of inherited genetic variants; it is not limited to cats or humans, and it is not accurately described as occurring in fewer than one in 1,000 children in all populations. So the correct choice is “more commonly in certain populations, such as the Amish.”
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