Natural selection can result in microevolution (change in allele frequencies), with the population's abundance of fitness-increasing alleles rising.extreme phenotypes have advantage over intermediate phenotypes
The term "phenotype" refers to a collection of an organism's outwardly apparent traits or attributes. It is derived from the Ancient Greek terms "phan," which means "to appear, display, or shine," and "tpos," which means "mark, type." The expression alludes to an organism's morphology, or physical form and structure, as well as to its physiological and biochemical traits, behavior, and the results of that behavior. The two main factors that determine an organism's phenotype are its genotype, or how its genetic code is expressed, and the influence of its environment. Both factors might interact, which would have a further effect on phenotype. A species is said to as "polymorphic" if it has two or more different phenotypes coexisting in the same population. Labrador Retrievers' coloring is a well-known instance of polymorphism
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