Multiple Choice
In the context of the peppered moth (Biston betularia), what is the typical wing color of the carbonaria morph?
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3. Extensions to Mendelian Inheritance
Understanding Independent Assortment
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Imagine that two unlinked autosomal genes, each with two alleles (A/a and B/b), are present in a heterozygous individual (genotype AaBb). According to the principle of independent assortment, what proportion of the gametes produced by this individual will have the genotype ab?
A
1/2
B
1/16
C
1/8
D
1/4
Verified step by step guidance1
Identify the genotype of the individual: AaBb, which means the individual is heterozygous for both genes A and B.
Recall that the genes are unlinked and assort independently, so the alleles for gene A and gene B segregate independently during gamete formation.
Determine the possible alleles for each gene in the gametes: for gene A, the gamete can carry either A or a, each with a probability of 1/2; for gene B, the gamete can carry either B or b, each with a probability of 1/2.
Calculate the probability of a gamete having the genotype 'ab' by multiplying the probabilities of getting 'a' from gene A and 'b' from gene B: $\frac{1}{2} \times \frac{1}{2}$.
Express the final proportion of gametes with genotype 'ab' as the product calculated in the previous step.
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