Which of the following describes how new genetic variations arise?
a. During the production of the sperm and egg, genes can spontaneously mutate and recombine to create new traits.
b. Natural selection causes stable genes to begin to mutate.
c. When a new trait is required for an organism's survival, the body begins to create new genes by recombining DNA sequences from existing genes.
d. The least "fit" members of a species acquire genetic material from the "fittest" members.
Answer: a
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