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:
a. 1/3 black ; 2/3 white
b. 1/2 white ; 1/2 black
c. 3/4 white ; 1/4 black
d. 2/3 black ; 1/3 white
and....
Genotype ratio Ww:ww
a. 2:1
b. 1:2
c. 1:1
d. 3:1

Answer 1

The first answer is B and the second is C Because half of the kids will be homozygous black, and the other half Heterozygous white.

Answer 2

Answer:

Option B, 1/2 white ; 1/2 black

Genotype ratio Ww:ww

Option C, 1:1

Explanation:

Given –  

First parent is heterozygous white  with genotype Ww

Second parent is homozygous black (ww)

If these two parents are crossed each other , the following offsprings are produced –  

W w

w Ww ww

w Ww ww

The genotype of Ww is white in color

The genotype of ww is black in color  

Thus there are ½ white and ½ black  

Genotype ratio –  

Ww: ww

2: 2

1:1