4. Many of the color varieties of summer squash are determined by several intera

Question

4. Many of the color varieties of summer squash are determined by several interacting loci: Wildtype squash are white, a recessive allele, a, causes yellow squash, while another recessive allele b, causes green squash. a) How would you test if these alleles are mutations in the same gene? And what result would you expect if they are not in the same gene. b) You do a cross to determine the relationship between genes A and genes B. You find B is epistatic to A. What cross did you perform? What was the result finding that led you to this conclusion?

Explanation / Answer

a) We will cross homozygous parents to produce heterozygous offsprings. This test is known as complementation. If the mutation occurs in the same gene then wild phenotype will not be produced, if they are on different genes then they might complement each other to produce the wild phenotype.

b)Homozygous individuals are crossed to produce heterozygous F1. F1 is crossed with each other. we would find that 12 would be white 3 would be yellow and 1 would be green. since B is epistatic to A, it being present in homo or heterozygous state will produce the white phenotype irrespective of another gene.

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