Question

in humans brown eyes are dominant over blue eyes .What type of offspring would you
expect if you crossed a hetrozygous brown eyed person to a heterozygous brown eyed person

Answer 1

Answer: the baby used to born with brown eyes because in f1 progeny only dominant gene will be expressed over recessive gene by the law of dominance

Explanation:

Answer 2

Given:

Brown eyes trait is dominant over blue eyes trait.

Both parents are heterozygous brown-eyed.

To Find:

The phenotype of the offspring.

Solution:

The phenotype and genotype of both parents.

Parent 1 = Heterozygous Brown-eyed = (Bb)

Parent 2 = Heterozygous Brown-eyed = (Bb)

On crossing both the parents,

⇒ (Bb) ×  (Bb)

We get two types of offspring

⇒ Phenotypic Ratio = 3:1 = Brown-eyed : Blue-eyed

⇒ Genotypic Ratio = 1:2:1 = (BB): (Bb): (bb)

The probability of brown-eyed offspring = (3/4) × 100 = 75%

The probability of blue-eyed offspring = (1/4) × 100 = 25%

Hence, the couple can have either brown-eyed or blue-eyed offspring.