Meiosis reduces the ploidy, to produce gametes with a single copy of the genome, so sexual recombination ensures the alleles of genes are recombined so there is more genetic variation in the population. Recombination of alleles in crossover increases variation, making new allele combinations possible by breaking linkages.
Genetic variation between members of a population leads to differential reproductive success and a shift in the frequency of the successful traits in subsequent generations, or evolution by natural selection.
Genetic variation between members of a population leads to differential reproductive success and a shift in the frequency of the successful traits in subsequent generations, or evolution by natural selection.
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Crossing over-more genetic variation