Answer :

To calculate the allelic frequencies for b and B in the fifth generation, use the Hardy-Weinberg equation. Substitute the given allele frequencies into the equation to solve for the frequencies in the fifth generation.

To calculate the allelic frequencies for b and B in the fifth generation, we can use the Hardy-Weinberg equation.

The equation is p^2 + 2pq + q^2 = 1, where p represents the frequency of the dominant allele (B) and q represents the frequency of the recessive allele (b).

Since we are given the frequencies of the alleles in the population, we can substitute these values into the equation to solve for the frequencies in the fifth generation.

Let's assume that the frequency of the B allele is p and the frequency of the b allele is q.

According to the given information, the frequency of the B allele is 0.45 (45%) and the frequency of the b allele is 0.55 (55%). Plugging these values into the equation, we have:

p^2 + 2pq + q^2 = 1

0.45^2 + 2 * 0.45 * 0.55 + 0.55^2 = 1

0.2025 + 0.495 + 0.3025 = 1

0.2025 + 0.495 + 0.3025 = 1

Calculating, we find that the frequency of the BB genotype (homozygous dominant) is 0.2025, the frequency of the Bb genotype (heterozygous) is 0.495, and the frequency of the bb genotype (homozygous recessive) is 0.3025.

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