A process of natural selection where heterozygous individuals are more adaptive, and thus selected for more often, than either of the two types of homozygous individuals. A theory that each B or T lymphocyte , when stimulated by antigen , divides to form a clone of itself. A type of natural selection which acts upon individual genes and alleles within an organism 's genome . A type of natural selection which acts upon whole groups rather than on individuals. A type of natural selection which acts upon individual organisms within a population .
Individual selection is the most common type of natural selection.
A type of natural selection which acts upon populations within a species . Interdemic selection occurs when populations die out or give rise to new populations at different rates, depending on whether they have traits that are beneficial or harmful to the population as a whole. The use of markers to follow the inheritance of genes , particularly those genes which cannot be readily identified. The differential survival and reproduction of organisms with genetic characteristics that enable them to better use environmental resources. Placing organisms under conditions where the growth of those with a particular genotype will be favored.