In a population of 100 individuals, we have 25 people that are homozygous AA, 50 people...

In a population of 100 individuals, we have 25 people that are homozygous AA, 50 people that are

heterozygous Aa, and 25 people that are homozygous aa.

How many A alleles are in the homozygous aa group?

Expert Solution

Answer: In the homozygous ‘aa’ there will not be ‘A’ allele.

Explanation: By the definition of hommozygosity,when both alleles for a particular trait are same the individual is said to be homozygous. In this case as it can be seen that both the alleles are ‘aa’ there is no scope of ‘A’ allele.

Similarly if the individual has AA alleles then he will not have an ‘a’ allele.

In the heterozygous individual for a particular trait, one of the alleles will be ‘A’ and the other allele will be ‘a’,so his genotype will be ‘Aa’

Additional information: the frequencies of homozygous AA individuals = 25%

The frequencies of homozygous aa individuals = 25%

And the frequencies of heterozygous individuals = 50%

If we apply the Hardy Weinberg equilibrium then p2 = 0.25(frequencies of homozygous AA individuals)

Hence p = 0.5 this is the frequency of ‘A’ allele in the given population.

Similarly q2 = 0.25 (The frequencies of homozygous aa individuals = 25%)

Hence q = 0.5 this is the frequency of ‘a’ allele in the given population

And 2pq will be the frequency of heterozygous ‘Aa’ = 2×0.5×0.5 = 50

gladiator answered 2 years ago

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