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27 February, 13:57

According to the hardy-weinberg principle, if 75% of the alleles in the gene pool are a1 and 25% are a2, what is the proportion of individuals with genotype a1a2 in this population?

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  1. 27 February, 14:51
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    Frequency of allele a1 is 75%, p=0.75

    Frequency of allele a2 is 25%, q=0.25

    If a population is in Hardy-Weinberg equilibrium then:

    p2+2pq+q2=1

    p2 is the frequency of genotype a1a1 (homozygous),

    2pq is the frequency of genotype a1a2 (heterozygous),

    q2 is the frequency of genotype a2a2

    The proportion of individuals with genotype a1a2 is then 2*0.75*0.25=0.375 (37.5%).
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