Evolution may be defined as the change in the heritable and behavioral characteristics of an organisms over successive generations. Evolution may occur due to natural selection, mutation, recombination and gene flow.
Evolution can change the genotypic frequency of a population. If these changes are heritable they can pass down to the next generations and change the genotype frequency.
The bee at the right is looking for nectar in a flower. While looking for food, this bee is also pollinating the flowers by transferring pollen from the ___anthers__ on one flower to the __stigma__ on another flower.
