All Old Order Amish families from Lancaster County with Ellis- van Creveld syndrome can trace their genealogies to Mr. and Mrs. Samuel King, who immigrated to Lancaster County in 1744. This is an example of___________ .

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The founder effect occurs when a new population is established by a very small number of individuals from a larger population, leading to a reduced genetic variation and a non-random sample of the genes present in the original population. In this case, the Old Order Amish families with Ellis-van Creveld syndrome can trace their ancestry back to a single couple, indicating that the genetic condition proliferated in the population due to the limited genetic pool of the initial founders.

All Old Order Amish Families from Lancaster County with Ellis-