When natural selection tends to split a population into two phenotypic groups, it is called:

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When natural selection tends to split a population into two phenotypic groups, it is called balanced polymorphism. This occurs when two or more alleles are maintained at high frequency in a population, and the heterozygous individuals have a selective advantage over homozygous individuals. This can lead to the formation of distinct phenotypic groups within a population. Gene flow refers to the movement of genes between populations, genetic drift is the random fluctuation of allele frequencies, stabilizing selection favors intermediate phenotypes, and coevolution is the reciprocal evolutionary change between interacting species.

When Natural Selection Tends to Split a Population into Two