On a planet, there is a population of Kangaroos. In this population, there is a
ID: 48643 • Letter: O
Question
On a planet, there is a population of Kangaroos. In this population, there is a phenotype known as Linda. Kangaroos with this phenotype prefer fruit to vegetables. Wild-type individuals like all forms of food. Linda is determined by a gene with two alleles (E = dominant (trait) allele, e = recessive (wild-type) allele).
It is know that the gene for Linda follows a homozygous-lethal dominant mode of inheritance with reduced penetrance (although the penetrance is not known with certainty). It is conjectured that the An affected Kangaroo and a true-breeding unaffected Kangaroo mate and produce 100 offspring. The numbers of affected and unaffected offspring are:
27 Linda offspring;
73 Wild-type offspring.
Which of the following values is the most like value for the penetrance of the Ee genotype?
a).20
b).99
c).44
d).10
e).75
Explanation / Answer
Frequency of EE (Linda) = 27/100 = (0.27)2 = 0.072
Frequency of ee (wild - type) = 73/100 = (0.73)2 = 0.53
The penetrance of Ee phenotype = (0.27) (0.73) = 0.197 or 0.20.
Option (a) is correct.
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