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In summer squash, white fruit colour is governed by a dominantallele (W) and yellow fruit colour by the recessive allele (w). Adominant allele at another locus (S) produces disc shaped fruitand its recessive allele (s) yields sphere-shaped fruit.a. What is the genotype of an individual heterozygous for bothgenes?b. What is the genotype of the gametes produced by thatindividual?c. What is the expected phenotypic ratio of the progeny of a crossbetween two plants heterozygous for both genes?

Question

In summer squash, white fruit colour is governed by a dominantallele (W) and yellow fruit colour by the recessive allele (w). Adominant allele at another locus (S) produces disc shaped fruitand its recessive allele (s) yields sphere-shaped fruit.a. What is the genotype of an individual heterozygous for bothgenes?b. What is the genotype of the gametes produced by thatindividual?c. What is the expected phenotypic ratio of the progeny of a crossbetween two plants heterozygous for both genes?

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Solution

a. The genotype of an individual heterozygous for both genes would be WwSs. This means that the individual has one dominant allele and one recessive allele for both the fruit color and shape genes.

b. The genotype of the gametes produced by that individual would be WS, Ws, wS, and ws. This is because during meiosis, the alleles for each gene segregate independently, leading to four possible combinations of alleles in the gametes.

c. The expected phenotypic ratio of the progeny of a cross between two plants heterozygous for both genes would be 9:3:3:1. This is the classic Mendelian ratio for a dihybrid cross. The 9 represents the progeny that are dominant for both traits (white and disc-shaped), the first 3 represents the progeny that are dominant for the first trait and recessive for the second (white and sphere-shaped), the second 3 represents the progeny that are recessive for the first trait and dominant for the second (yellow and disc-shaped), and the 1 represents the progeny that are recessive for both traits (yellow and sphere-shaped).

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