In summer squash, white fruit color (W) is dominant over yellow fruit color (w). If a squash plant homozygous for white is crossed with a plant homozygous for yellow, what will the phenotypic and genotypic expression of the trait in the given cross.
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Answer:
Using uppercase letters for dominant alleles and lowercase letters for recessive alleles, we can represent the genotypes of the two parent squash plants as follows:
WW (homozygous white) × ww (homozygous yellow)
The Punnett square for this cross would be:
| | W | W |
|---|---|----|
| w | Ww | Ww |
| w | Ww | Ww |
In this case, all of the F1 progeny will have the genotype Ww, since they inherit one dominant W allele from the white parent and one recessive w allele from the yellow parent.
Phenotypically, all of the F1 progeny will show the dominant white trait, since W is dominant over w.
Therefore, the genotypic expression of this cross is 100% Ww, while the phenotypic expression is a 100% white.
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