Some of the mechanisms that help repair wounds or fight off infection can result in cancer when we’re old. Why hasn’t evolution eliminated these processes? Hint: Do conditions of postreproductive age affect natural selection?

Some of the mechanisms that help repair wounds or fight off infection can result in cancer when we’re old. Why hasn’t evolution eliminated these processes? Hint: Do conditions of postreproductive age affect natural selection?

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter19: Population Genetics And Human Evolution

Section: Chapter Questions

Problem 21QP

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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.

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