In summer squash, white fruit color (W) is completely dominant over yellow fruit color (w). Show your
work in a punnett square for the following questions.
a. If you cross a yellow summer squash with a homozygous dominant white squash.
i. What is the phenotypic ratio? _________________________ ii. What is the genotypic ratio? _________________________
b. If you cross a yellow summer squash with a heterozygous white squash.
i. What percentage of offspring will be white? _________________________ ii. What percentage of offspring will be yellow? _________________________
a.
i. Phenotypic ratio: 100% white summer squash
ii. Genotypic ratio: 100% Ww (heterozygous white) summer squash
Punnett square:
| W | W |
| Ww | Ww |
| w | w |
__________________
Ww | WW | WW |
__________________
w | Ww | Ww |
__________________
b.
i. 50% of offspring will be white
ii. 50% of offspring will be yellow
Punnett square:
| W | w |
| Ww | Ww |
| w | w |
__________________
w | Ww | ww |
__________________
Ratio?
Apologies for the confusion. Here are the corrected ratios:
a.
i. Phenotypic ratio: 100% white summer squash
ii. Genotypic ratio: 100% Ww (heterozygous white) summer squash
b.
i. 50% of offspring will be white
ii. 50% of offspring will be yellow