Question

In horses, the allele for straight hair (H) is dominant, and the allele for curly hair (h) is recessive. A horse breeder mates a homozygous doninant mother with a heterozygous male. What is the chance that the offspring will have straight hair?

Answer 1

Answer: The correct answer is -

The chance that the offspring will have straight hair is 100%

Explanation:

As per the given information in the question, straight hair (H) is a dominant trait over curly hair (h) which is a recessive trait.

Dominant trait masks the expression of recessive trait.

Straight hair can have two genotypes that are HH and Hh, whereas recessive trait that is curly hair will only be expressed when present in 'hh' genotype (Homozygous recessive).

Genotype of parents are-

Mother- HH (homozygous dominant)

Father - Hh (heterozygous dominant).

When they are crossed, they will result into following offspring-

HH X Hh

=HH, Hh, HH, Hh

This indicates that all the offspring will be produced with straight hairs.

Thus, there is 100% chance of getting offspring with straight hairs.

Answer 2

It would be 75% because that is 3/4, the chances of dominant offspring.