Ask Question
26 May, 09:18

If the frequency of homozygous dominant is 60%, the frequency of heterozygous is 20%, and the frequency of homozygous recessive is 20%, what is the frequency of the dominant allele, and the frequency of the recessive allele

+4
Answers (1)
  1. 26 May, 12:03
    0
    When a genetic population follows Hardy-Weinberg Equilibrium (HW), it states that certain biological tenets or requirements must be met. Given so, then HW states that the total frequency of all homozygous dominant alleles (p) and the total frequency of all homozygous recessive alleles (q) for a gene, account for the total # of alleles for that gene in that HW population, which is 100% or 1.00 as a decimal. So in short: p + q = 1, and additionally (p+q) ^2 = 1^2, or 1

    So (p+q) (p+q) algebraically works out to p^2 + 2pq + q^2 = 1, where p^2 = frequency of homozygous dominant individuals, 2pq = frequency of heterozygous individuals, and q^2 = frequency of homozygous recessive individuals.

    So the problem states that homozygous dominant individuals (p^2) account for 60%, or 0.60. Thus the square root (sr) of p^2 = p or the dominant allele frequency in the population. So sr (p^2) = sr (0.60) - - >

    p = 0.775 or 77.5%

    Homozygous recessive individuals (q^2) account for 20%, or 0.20. Thus sr (q^2) = q or the recessive allele frequency in the population. So sr (q^2) = sr (0.20) - - > q = 0.447 or 44.7%

    But since 44.7% + 77.5% = 122.2%, which is not equal to 1, we have a situation in which the allele frequencies do not match up, therefore this population cannot be determined using the Hardy-Weinberg Equation.
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “If the frequency of homozygous dominant is 60%, the frequency of heterozygous is 20%, and the frequency of homozygous recessive is 20%, ...” in 📘 Biology if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers