alleelipitoisuus

Alleelipitoisuus refers to the frequency of a specific allele within a population's gene pool. An allele is a variant form of a gene, and for each gene, an individual typically inherits two alleles, one from each parent. Alleelipitoisuus is usually expressed as a proportion or a percentage. For example, if a gene has two alleles, 'A' and 'a', and in a population of 100 individuals, 60 individuals have the genotype AA, 30 have Aa, and 10 have aa, the frequency of allele 'A' can be calculated. Each AA individual contributes two 'A' alleles, and each Aa individual contributes one 'A' allele. Therefore, the total number of 'A' alleles is (60 * 2) + (30 * 1) = 150. With a total of 200 alleles in the population (100 individuals * 2 alleles each), the alleelipitoisuus of 'A' would be 150/200, or 0.75 (75%). Conversely, the frequency of allele 'a' would be (30 * 1) + (10 * 2) = 50, so its frequency is 50/200, or 0.25 (25%). Changes in alleelipitoisuus over time are the fundamental basis of evolution, driven by mechanisms such as mutation, genetic drift, gene flow, and natural selection. Understanding alleelipitoisuus is crucial in fields like population genetics, conservation biology, and evolutionary studies.