Question 43 In your continued work with T. bell adults this time), you discover

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Question 43 In your continued work with T. bell adults this time), you discover two mutant standard red, In both strains, know animals have pink exoskeletons (as opposed to the you know that the exoskeleton color is due toa You cross a pink T. bell from one strain to a pink T. bell from the strains in which all of the m this second strain and find that all of the offspring have red exoskeletons. Fro experiment you would c likely have mutations... onclude that the two mutant pink strains of T. bell most in the homeotic Chalupa genes. at different gene loci at the same gene locus Owithin the promoter of the exoskeleton color gene. Proctorio is sharing your screen Stop sharing D Question 44 2.5 pts SAS 8 9 M

Explanation / Answer

Answer: Choice 4

Reason: According to the information, the two pink organisms were crossed and the progeny so obtained bears red colored exoskeleton. Since the exoskeleton color is regulated by a single gene, it is very likely that a mutation in the promoter region of this gene might have taken place. Promoter represents the region where that RNA polymerase binds and performs gene expression. The strength of binding of the RNA polymerase to promoter identifies the extent of gene expression, hence phenotype. If the binding between the two elements is loose, low expression would result. Thus, the cumulative data here represents that poor binding of the RNA polymerase over promoter secondary to promoter-mutation led to development of pink color.

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