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Question: the old order amish population of pennsylvania is descended from...

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The Old Order Amish population of Pennsylvania is descended from a small group of Germans who migrated to the U.S. in the 1700s. Typically, church members marry within their own community. This population is characterized by a high frequency of Ellis-van Crexald syndrome, a form of dwarfism that also involves polydactyly (extra fingers/toes). This syndrome is rare in the larger population of the United States. Which evolutionary mechanism might best explain this phenomenon and why? 8.
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