On the planet Yado, there is a population of Lingkons. In this population, there

Question

On the planet Yado, there is a population of Lingkons. In this population, there is a phenotype known as Eganro. Lingkons with this phenotype prefer fruit to vegetables. Wild-type individuals like all forms of food. Eganro is determined by a gene with two alleles (E = dominant (trait) allele, e = recessive (wild-type) allele). It is know that the gene for Eganro 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 Lingkon and a true-breeding unaffected Lingkon mate and produce 100 offspring. The numbers of affected and unaffected offspring are: 27 Eganro offspring; 73 Wild-type offspring. Which of the following values is the most like value for the penetrance of the Ee genotype?

Explanation / Answer

The frequency of expression of an allele when it is present in the genotype of the organism is called “penetrance.”

Upon crossing the affected Lingkon (Ee) with unaffected Lingkon (ee), 50% of the offspring has the genotype Ee.

     Ee x ee

Ee, Ee, ee, ee

But, only 27% expressed Eganro phenotype. Therefore, the penetrance value is 0.27.

From the given options, option (c) 0.20 is the most likely value for the penetrance of the Ee genotype.

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