20. In certain species of summer squash, fruit color is determined by two interacting genes. A dominant allele, W, determines white color, and a recessive allele (w) allows the fruit to be colored. In a homozygous ww individual, a second gene determines fruit color: G (green) is dominant to g (yellow). A white squash and a yellow squash were crossed, and the F1 generation yielded approximately 50% white fruit and 50% green fruit. What are the genotypes of the parents?

Question

Madison

Biology

26 February, 11:09

20. In certain species of summer squash, fruit color is determined by two interacting genes. A dominant allele, W, determines white color, and a recessive allele (w) allows the fruit to be colored. In a homozygous ww individual, a second gene determines fruit color: G (green) is dominant to g (yellow). A white squash and a yellow squash were crossed, and the F1 generation yielded approximately 50% white fruit and 50% green fruit. What are the genotypes of the parents?

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Hahn · Answer 1

WwGg and wwgg

Explanation:

Here you need to analyze what you want to breed and how you get it.

One of the parents was white so it has at least one of its alleles dominant (W), but the other one should be (w) because some breeding is colored.

And even though, we can't see its color we know it has at least one allele for green (G) because of the offspring, and the other one could be green (G) or yellow (g).

The other parent was yellow so, it's both alleles only can be (ww) and (gg) all recessive.

Now we can draw a Punnet square and discover that the F1 of those parents (WwGg and wwgg) is 50% white and 50% green.