In natural selection, _____ that increase survival and reproductive success become more common in a population.

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Natural selection acts on phenotypes, which are the observable characteristics of an organism. Traits that increase survival and reproductive success are more likely to be passed on to future generations, leading to an increase in their frequency within a population. Genotypes (the genetic makeup of an organism) and allele frequencies (the relative proportions of different versions of a gene) can also be affected by natural selection, but ultimately it is the phenotypes that are subject to selection. Bottlenecks refer to a reduction in the size of a population, which can impact genetic diversity but may not necessarily be related to natural selection.

In Natural Selection, _____ That Increase Survival and Reproductive Success