Question

Which statement correctly describes the role of chance in evolution?
A) An allele that increases evolutionary fitness cannot be lost from a population by chance events. B) The ultimate source of new alleles is mutation, random changes in the nucleotide sequences of an organism's DNA C) Evolutionary change proceeds by an accumulation of changes that occur by chance. D) None of the above

Answer 1

Explanation:

chance in evolution?

A) An allele that increases evolutionary fitness cannot be lost from a population by chance events. B) The ultimate source of new alleles is mutation.

Answer 2

Answer: B - The ultimate source of new alleles is mutation, random changes in the nucleotide sequences of an organism's DNA

Explanation: Without variation (which arises from mutations of DNA molecules to produce new alleles) natural selection would have nothing on which to act. Gene mutations result in new alleles, and are the source of variation within populations. Gene mutations are ultimately behind the other mechanisms that provide variation.

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