Two genes, A/a and B/b, control fruit color in squash. The inheritance pattern for this trait...

Two genes, A/a and B/b, control fruit color in squash. The inheritance pattern for this trait fits one of the multiple gene types that we discussed in class. A homozygous plant with white fruit was crossed with a homozygous plant with yellow fruit. All the progeny had red fruit. When two F1 plants were crossed, the F2 consisted of 38 white, 27 yellow, and 89 red.

(a) (2 pts) Which type of gene interaction do we see here? Explain your reasoning.

(b) (2 pts) What is the expected ratio of white to yellow to red fruit in the F2?

(c) (3 pts) What were the genotypes of the P generation plants?

(d) (5 pts) Test your hypothesized gene interaction model with Chi-square analysis. Please include all the components of Chi-square analysis in your answer.

(Continues on the back…)

(e) (5 pts) The diagram explains how the two genes interact at the molecular level. Compounds X, Y, and Z determine fruit color depending on which of the two chemical reactions occur. Each gene produces an enzyme that is either active or inactive depending on its genotype.

When an enzyme is active, the reaction it catalyzes occurs; when it is inactive, the reaction is blocked. Write in the boxes the genotypes that would explain the inheritance pattern.

(2 pts) Please fill in the box with the according genotypes.

(3 pts) Interpret the pathway with your own words (e.x. how to read this pathway? how you get white, yellow and red colors from different genotypes by following this pathway graph? Circle out the epistatic genotype in your pathway)

Expert Solution

gladiator answered 8 months ago

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