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Unformatted text preview: POPULATION GENETICS POPULATION: the total of all individuals in a herd, breed, species, etc.; those individuals that inhabit a specific area; a specified group of individuals that are related; a group of animals related by a specific trait; ETC. In dealing with individual matings, individual traits can be measured, genotypes often can be determined, and the probability of traits being exhibited in offspring can be fairly accurately predicted. This is NOT always the case when we deal with populations. In populations, where genotypes of the breeding animals for a single trait are seldom known and matings are NOT controlled , it is difficult to PREDICT with any accuracy the GENOTYPIC RATIOS of the offspring. However, using certain rules and restrictions, the Laws of Inheritance can be applied to populations. GENE FREQUENCIES: Gene Frequency refers to the relative presence (abundance or rarity) of a particular gene in a population as compared to its own alleles in that same population. example: In a herd of ALL horned Hereford cattle, each individual is pp (homozygous recessive) for the horned trait. Bulls = pp X Cows = pp Î offspring = pp = horned. The gene frequency for the p gene is 100%. example: If we introduce homozygous Polled bull(s) into the population (and remove all horned bulls), what are the gene frequencies?...
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This note was uploaded on 01/16/2012 for the course ANSCI 319 taught by Professor Donhenneke during the Fall '11 term at Tarleton.
- Fall '11