Question

Hypercholesterolemia is a disorder in which blood cholesterol levels are elevated. The H allele is incompletely dominant to the h allele, with hh homozygotes having extremely high levels of blood cholesterol. A husband and wife are both Hh heterozygotes. What is the chance that their first child will have normal levels of blood cholesterol?

Answer 1

25 %

Step-by-step explanation:

Given -

H allele is incompletely dominant to the h allele

Thus,

HH represents normal level of blood cholesterol levels

Hh represents intermediate level of blood cholesterol levels

hh represents high level of blood cholesterol levels

Parents genotype - Hh (heterozygous)

Thus F1 generation cross would be between Hh and Hh

Hh * Hh

HH, Hh, Hh, hh

Out of four only one (HH offspring) has normal levels of blood cholesterol

Thus the percentage is

`(1)/(4) * 100\\= 25`%