3. Which correctly describes a genetic trait that is sex-linked in humans? A. The trait appears only in males or only in females, but not in both. B. The gene is always carried on the Y chromosome. C. The trait is expressed only during the act of reproduction. D. The trait is carried on the X or Y chromosome.

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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.