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Imagine a population of 100 snails in which shell colour is controlled by two alleles : \( B \) (black) and b (yellow). 20 of the snails are yellow \( (\mathrm{b} / \mathrm{b}) \) and 80 are black \( (\mathrm{B} / \mathrm{B} \) or \( B / \mathrm{b}) \). Of the 80 black snails, 30 are homozygous and 50 are heterozygous.
A. How many of the loci for this gene are occupied by the B allele?
\( B \). What is the allelic frequency of \( B \) ?
C. Assuming sexual reproduction with random mating, no gene flow and no selection, what will be the frequency of yellow snails in the next generation of the population?
D. What is the total number of loci for the gene for shell colour in this population?
(a) \( A-110 ; B-0.55 ; C-0.20 ; D-200 \)
(b) \( A-100 ; B-0.50 ; C-0.20 ; D-400 \)
(c) \( A-120 ; B-0.55 ; C-0.25 ; D-100 \)
(d) \( A-100 ; B-0.55 ; C-0.25 ; D-1 \)
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