Determine proportion for the f2 generation

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a+, b+, c+ and d+ are independently assorting Mendelian genes controlling the production of a black pigment. The alternate alleles that give abnormal functioning of these genes are a, b, c, and d. A black individual of genotype a+/a+ b+/b+ c+/c+ d+/d+ is crossed with a colorless individual of genotype a/a b/b c/c d/d to produce a black F1. F1 x F1 crosses are then done. Assume that a+, b+, c+ and d+ act in a pathway as follows: colorless --a+--> colorless --b+--> colorless --c+--> brown --d+-->black.

a. what proportion of the F2 generation will be colorless?

b. what proportion of the F2 generation will be black?

c. what proportion of the F2 generation will be brown?

 

Reference no: EM1396638

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