Sexual reproduction is the answer.
- Sexual reproduction increases genetic variation. It allows reshuffling of the genetic material , each with a genetic makeup different from that of its parents. In sexual reproduction, fertilization occurs and male and female gametes unite to form a zygote which after several stages form a individual.
- According to Hardy and Weinberg , gene and genotype frequency of a Mendelian population remain constant generation after generation unless there is selection, mutation, migration or random drift. This is known as Hardy Weinberg Theorem. So sexual reproduction cause changes in genetic material and cause changes in genes so the frequencies of alleles in a population changes.
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