Describe the role of meiosis in natural selection

Describe the role of meiosis in natural selection

• During prophase I of meiosis, crossing over occurs between homologous chromosomes and exchange of chromosome segments occurs. This separates linked genes and provides a source of genetic recombination.
• During metaphase 1 of meiosis, chromosomes are distributed randomly at the equatorial region and subsequently segregate independently during anaphase1. This leads to further mixing of genes which are then expressed in the gametes. The genetic rearrangement which occurs passes into the gametes and is manifested as phenotypic variations among the organisms of a population.
• A selection pressure acts on these variations; organisms with more favorable variations survive and reproduce while the less suitably adopted organisms die and maybe wiped out. This may lead to emergence of new strains of organisms with favorable variation.

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