Vertebrate limbs can be used as wings, legs, or flippers . Many examples have been found for evidence of natural selection operating in the world today. Examples include Peppered moths in pre- and post industrial England. How Evoution Works Gene Frequencies Genes can be found in different versions and these are called alleles . Allele frequencies refer to the proportion of each allele within a population.
Microevolutionary change is any change in allele frequency in a population through time.
This refered to as the Hardy-Weinberg equilibrium. Thouroghbred horses went through such a bottleneck in the late 16th century. Virtually all thoroughbreds are descended from 6 arabian stallions in the late 1500's. Individuals are selected on the basis of their alleles in their specific environment 1. The members are reproductively isolated from other organisms.