Allelic Frequency If you are told that the frequency of a recessive allele in a

Question

Allelic Frequency If you are told that the frequency of a recessive allele in a population is 10%, you are directly given q, since by definition q is the frequency of the vecessive allele. This comprises all the coples of the recessive allele that are present in heterozygotes as well as all the coples of the allele in individuals that show the recessive phenotype. What is q for this population? If you need help, look back at the Hardy-Weinberg equation Checek Your Answer Genotypic Frequency Recessive Dominant Genotypic frequency is the frequency of a genotype-homozygous recessive, homozygous dominant, or heterozygous-in a population. If you don't know the frequency of the recessive allele, you can calculate it if you know the frequency of individuals with the recessive phenotype (their genotype must be homozygous recessive). Sample Problem If you observe a population and find that 16% show the recessive trait, you know the frequency of the aa genotype. This means you know q. What is q for this population? Check Your Answer

Explanation / Answer

Hardy weinberg`s equation-

p2 + 2pq + q2 = 1 and p + q = 1

p = frequency of the dominant allele in the population
q = frequency of the recessive allele in the population
p2 = percentage of homozygous dominant individuals
q2 = percentage of homozygous recessive individuals
2pq = percentage of heterozygous individuals

1.If 10% allele is recessive-

q2 =10% =0.1

q = root of 0.1 = 0.32

2.If q2 = 16% = 0.16

then q = root of 0.16 = 0.4

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