New combinations of genetic material give rise to genetic variability in sexually reproducing organisms through
A) crossover events between nonsister homologous chromatids.
B) crossover events between sister chromatids.
C) egg and sperm genetic recombination from distinct individuals.
D) egg and sperm genetic recombination from one individual in which crossing over and independent assortment of homologues has occurred.
E) A,C,and D all contribute to genetic variability.
Correct Answer:
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