The gradual change in specific human mitochondrial DNA sequences along a river illustrates

Question

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The gradual change in specific human mitochondrial DNA sequences along a river illustrates a cline, which is a gradual change in the frequency of a characteristic or allele across a geographic, ecological, or temporal gradient. This gradual change can indicate adaptation to environmental gradients or the movement of a population over a particular range. The other answer choices, such as founder effect, population bottleneck, and spontaneous mutation, do not specifically explain the gradual change in DNA sequences along a river.

The Gradual Change in Specific Human Mitochondrial DNA Sequences Along