On the planet Rockon, there is a small island by the name of Krokus. People who
ID: 133426 • Letter: O
Question
On the planet Rockon, there is a small island by the name of Krokus. People who live on this island are subject to a condition known as Callus Digito, that enables them to musical instruments with greater skill. The phenotype is caused by a single gene with two alleles, A (dominant allele) and a (recessive allele). On this island, the phenotype is expressed in a dominant fashion, with following penetrance values (Table 1):
A cross of a true-breeding Callus Digito individual and a true-breeding individual (genotype = aa) without the phenotype occurs. Offspring in the F1 generation mate to produce F2 offspring.
Meanwhile, on a separate island, called Rana, the same phenotype is inherited in a recessive fashion. The penetrance values on this island are given in Table 2:
Table 2. Penetrance values for Callus Digito on the Rana Island.
As on Krokus, a cross of a true-breeing Callus Digito person and a true-breeding unaffected individual (genotype aa) occurs. Offspring in the F1 generation mate to produce F2 offspring.
Which island will have a greater proportion of Callus Digito individuals in the F2generation?
A. Krokus Island, with proportion 0.6401.
B. The proportions will be equal for the two islands.
C. Rana Island, with proportion 0.2375.
D. Rana Island, with proportion 0.3875.
E. Krokus Island, with proportion 0.6125.
Table 1. Penetrances of Callus Digito on the Krokus Island. Genotype Penetrance AA 0.8 Aa 0.8 aa 0.05Explanation / Answer
As on Krokus, a cross of a true-breeding Callus Digital person and a true-breeding unaffected individual (genotype aa) occurs. Offspring in the F1 generation mate to produce F2 offspring.
Which island will have a greater proportion of Callus Digital individuals in the F2generation?
Answer:
E. Krokus Island, with proportion 0.6125.
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