In cows, long hair is dominant to short hair. in a cow that is heterozygous for long hair, what percentage of the cells undergoing meiosis will carry the dominant allele?

Given -

Organism under consideration - cow

Character - size of the hair

Dominant trait - long hair

Recessive trait - short hair

Genotype - heterozygous dominant

Solution -

Let the dominant trait be represented by L

Let the recessive trait be represented by l

In heterozygous condition the parent cow will have alleles as - Ll (male), Ll (female)

Cross between male and female would result in

L l

L LL Ll

l Ll ll

Phenotype of the offspring - 75% with long hair, 25% with short hair

Genotype of the offspring - Homozygous dominant - 25%

Heterozygous dominant - 50%

Recessive dominant - 25%

Therefore, offspring's with dominant allele is 75% (25 + 50)