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genetic diseases sometimes occur at high frequency in populations that are, or once were, relatively isolated. for example, an enzyme deficiency called hereditary tyrosinemia occurs at an unusually high rate in the chicoutimi region in canada. a condition called porphyria is unusually common in south africans of dutch descent. why are genetic diseases so common in isolated populations?


My dear students, it is a well-known fact that genetic diseases tend to be more prevalent in isolated populations. The reason for this lies in what we call the founder effect. You see, when a small group of one species migrates to a new location and establishes a new population, the resulting offspring will possess genotypes and physical traits that are similar to those of the initial, small and separated group. This reduction in genetic variance can put the population at a higher risk of developing genetic diseases. This phenomenon is exacerbated by the fact that the new subpopulation is often geographically and socially isolated, further reducing its gene pool. To learn more about the founder effect and its implications, I encourage you to visit brainly.com/question/28217649?referrer=searchResults #SPJ4.