In summer squash fruit color exhibits epistatsis. There are two genes that affec

Question

In summer squash fruit color exhibits epistatsis. There are two genes that affect the color, W and G, and each has two alleles one dominant and one recessive. White color is caused by the dominant W allele. This allele is epistatic to G; that is, any squash with a W allele is white, regardless of the genotype for G. If and only if the fruit is homozygous ww, then G_ produces a green fruit and gg produces a yellow one. Assume you have a white squash of genotype (WwGg) which you mated with green squash of genotype (wwGg). Fill out the Punnet square below and then predict the phenotypic ratio in the offspring.

4x4 Punnet Square

Explanation / Answer

Epistasis is a condition when expression of one gene is dependent on the presence of another gene referred to as 'modifier genes'. In summer squash allele W is epistatic to G. In presence of dominant allele W and G always produces white fruit. In presence of recessive allele w and in presence of G green fruit is produced. Yellow fruit is produced only in presence of homozygous alleles for both the genes w and g.

On crossing white squash of genotype (WwGg) with green squash of genotype (wwGg) the gametes produced, the genotypes and phenotypes of the offsprings are represented in the Punnet

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