Which of the following is true about duplication? I. Caused by extras from translocations, crossovers within an inversion, and unequal crossing over II. More likely to be fatal if large number of chromosomes are involved, however may result to variation based on what genes are duplicated III. Provides raw material for genetic evolution just like several pseudogenes in humans that are “inactivated” duplicates IV. Results in only 45 chromosomes in body cells of carrier individuals instead of having 46 chromosomes *   I, II, III       III, IV       IV       I, II

Q: 9

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A:

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A:

Q: None

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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.