4. Because only chance events—that is, the effect of small population size—are responsible for the change in gene frequencies, would you say that evolution has occurred? Explain. 5. Since the 1890s when northern elephant seals were hunted almost to extinction, the populations have increased to 30,000 animals. In a 1974 study of genetic variation, scientists found that all elephant seals are fixed for the same allele at 24 loci. Explain.
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Evolution is defined as the change in the genetic composition of a population over time. This change can be due to various factors such as natural selection, genetic drift, gene flow, and mutation. Show more…
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