Review Mendel
Assume B is dominant and represents black feathers in chickens; assume b is recessive and
represents white feathers, or "no-black." Determine the feather color(s) of the F, offspring when a
purebred black rooster is crossed with a purebred white hen.
> P genotypes:
> F, genotype(s):
> F, phenotype(s):
> Phenotypes possible in this inheritance pattern
or

The parental genotype (P) will be : BB for the black rooster, bb for the white hen.

The F genotype will be : Bb

The F phenotype will be : all black offspring

Phenotype possible in this inheritance pattern will be black or white.

Explanation:

To depict the outcomes of a cross between a purebred black rooster and a purebred white hen, the following punnet square can be made:

    b     b

B    Bb Bb

B    Bb Bb

As the outcomes of the punnet square depict, all of the offsprings will be black as it is the dominant trait. The recessive trait will become suppressed.

However, all of the offsprings will be heterozygous for the trait, Bb.

you know they are heterozygous for a trait because they have it as jj or jj.