. In browsing through the chimpanzee genome, you findthat it has three homologs of a particular gene, whereashumans have only two.a. What are two alternative explanations for thisobservation?b. How could you distinguish between these twopossibilities?

. In browsing through the chimpanzee genome, you findthat it has three homologs of a particular gene, whereashumans have only two.a. What are two alternative explanations for thisobservation?b. How could you distinguish between these twopossibilities?

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter19: Evolutionary Change In Populations

Section: Chapter Questions

Problem 19TYU

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Concept explainers

Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.

Question

. In browsing through the chimpanzee genome, you find
that it has three homologs of a particular gene, whereas
humans have only two.
a. What are two alternative explanations for this
observation?
b. How could you distinguish between these two
possibilities?

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Neanderthal Hair Color The MCIR gene regulates pigmentation in humans (Sections 14.1 and 15.l revisited), .so loss-of-function mutations in this gene affect hair and .skin color. A person with two mutated alleles for this gene makes more of the reddish melanin than the brownish melanin, resulting in red hair and pa le skin. DNA extracted from two Neanderthal fossils contains a mutated MC1R allele that has not yet been found in humans, To see how the. Neanderthal mutation affects the function of the MC1R gene, Carles Lalueza-Fox and her team introduced the allele into cultured monkey cells (FIGURE 26.1 6). FIGURE 26.16 MC1R activity in monkey cells transgenic for an unmutated MClR gene, the Neanderthal MC1R allele or the gene for green fluorescent protein (GFP). GFP is- not related to MC1R. 2. What does this imply about the mutations effect on Neanderthal hair color?
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