Question

If one parent is heterozygous white (Ww) and the other is homozygous black (ww), give the phenotype and genotype ratios for this cross.

Phenotype: ______
Genotype ratio Ww:ww ____


Plz help?? Trying to make up credits so I can graduate.. Thanks so much

Answer 1

Phenotype: Ww, ww

Genotype Ratio: 2/4, 50/50 or half and half

Answer 2

There are two phenotype: black and white.

As we can observe that in heterozygous condition (Ww) the phenotype is white. Hence, white is a dominant character whereas black is a recessive character which will be expressed only under homozygous recessive condition i.e. (ww).

Now, Ww will form two types of gametes W and w whereas ww will form only one type of gamete i.e. w.

Cross (mentioned in the attached file)

There are two white and two black offspring. Hence, the phenotypic ration (white:black) would be 2:2 which comes out to be 1:1.

Similarly, there are two Ww and two ww. Hence, genotypic ratio (Ww:ww) would be 2:2 which comes out to be 1:1.