Answer :
Natural selection is the variation in individual survival and procreation brought on by phenotypic variances. The development of a population's heritable features across generations is a fundamental process of evolution.
Natural selection can boost the frequency of the beneficial alleles from one generation to the next, or create microevolution, when a phenotype generated by certain alleles helps organisms survive and reproduce better than their contemporaries. Natural selection affects the entire organism; the individual is the unit of selection. NS is unable to affect specific alleles (genes). The phenotype, not the genotype, is the unit of natural selection. However, it has the potential to alter genotype. Because an organism's phenotype is what interacts with its environment, natural selection focuses on it. The physical characteristics and observable attributes that enable an organism to survive in its environment make up the phenotype. By expressing the proteins that result in the visible features, the genotype regulates the phenotype.
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