From the 1700s to the early 1950s there was an unusually high percentage of deaf people on the island of Martha’s Vineyard off the coast of Massachusetts, USA. Deafness was a recessive hereditary trait, and there was a very small population of people living on the island. This meant that almost everyone had both deaf and hearing siblings. In the mid-1850s, the frequency of deaf people on the island was well over 30% higher than the U.S. national average. The high frequency of deaf individuals on the island of Martha’s Vineyard is best explained by Select one: a. genetic drift b. founder effect c. non-random mating d. bottleneck effect

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