Question

Natural selection occurs when

A) a new genetic variation occurs that allows individuals to have a reproductive and survival advantage.

B) a factor in the environment alters the genetic information in DNA of all members of a species.

C) only when nonrandom mating occurs.

D) when a small number of individuals of a population break away and form a new population.

Answer 1

Answer. A. A new genetic variation occurs that allows individuals to have a reproductive and survival advantage.

Explanation- Natural selection occurs when a genetic variation that works as an adaptation against the existing adverse conditions, provides reproductive and survival advantage to that organism. Environment selects the best organism which can survive further.

A factor in the environment that alters the genetic information in DNA of all members of a species is known as mutation.

Non random mating leads to sexual selection.

When a small number of individuals of a population breakaway and form a new population it is known as genetic drift.

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