Solutions For An Introduction to Genetic Analysis Chapter 4 Problem 60P

b) Earth phenotypes for all three characters:

This would be the same as the proportion of progeny with all Vulcan characters. Since the parentals have half Earth alleles and half Vulcan alleles, the proportion of progeny with only the 3 Earth alleles would be 0.34.

c) Vulcan ears and heart but Earth adrenals:

For a child to have Vulcan ears and heart but with Earth adrenals, a crossover must occur in both regions producing double crossovers. The frequency of Vulcan ears, heart, and Earth adrenals would be half the double crossovers:

d) Vulcan ears but Earth heart, and adrenals:

For a child to have Vulcan ears but the heart and adrenals of the Earth, a single crossover needs to occur between P and A. No crossover should occur between A and R. The frequency can be calculated in this way:

Out of this, half consist of the genotype of Par and the other half have the genotype of pAR. Therefore, the proportion of progeny with Vulcan ears but Earth heart and adrenals will be 0.06.