Lancaster County, Pennsylvania was first settled by a small number of Amish people in the early 1700's. The population has grown to over 85,000 individuals today, with most reproduction occurring within the group. Maple syrup urine disease affects only about 1 in 225.000 newborns in the U.S., but it affects 1 in 400 newborns in Lancaster. This high incidence of maple syrup urine disease in Lancaster probably reflects which phenomenon?

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Inheritance and Mendelian Genetics

Inheritance means the passing of traits to offspring from parents. These traits could be passed either through asexual reproduction or sexual reproduction. The offspring receives the genetic material from the parents. Mendelian inheritance is a certain biological inheritance that follows the rules and principles laid down by Gregor Mendel in 1865. The initial hypothesis was considered wrong, but other inheritance theories modified the concept of inheritance and thus genetics.