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For more information, log on to- • http://shomusbiology.weebly.com/ • Download the study materials here- • http://shomusbiology.weebly.com/bio-m... • The Hardy--Weinberg principle (also known as the Hardy--Weinberg equilibrium, model, theorem, or law) states that allele and genotype frequencies in a population will remain constant from generation to generation in the absence of other evolutionary influences. These influences include non-random mating, mutation, selection, genetic drift, gene flow and meiotic drive. Because one or more of these influences are typically present in real populations, the Hardy--Weinberg principle describes an ideal condition against which the effects of these influences can be analyzed. • In the simplest case of a single locus with two alleles denoted A and a with frequencies f(A) = p and f(a) = q, respectively, the expected genotype frequencies are f(AA) = p2 for the AA homozygotes, f(aa) = q2 for the aa homozygotes, and f(Aa) = 2pq for the heterozygotes. The genotype proportions p2, 2pq, and q2 are called the Hardy-Weinberg proportions. [Note that p + q = (p + q)2 = p2 + 2pq + q2 = 1]. • If union of gametes to produce the next generation is random, it can be shown that the new frequency f′ satisfies \\textstyle f'(\\text{A}) = f(\\text{A}) and \\textstyle f'(\\text{a}) = f(\\text{a}). That is, allele frequencies are constant between generations. Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia. • Link- http://en.wikipedia.org/wiki/Main_Page PPT source: All the PowerPoint material is from Sciencegeek.net. Copyright by sciencegeek.net. • Link- http://www.sciencegeek.net/Biology/Po...
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