# Suppose that the " fabulous " phenotype is controlled by two independent genes, A and B,...

###### Question:

Suppose that the " fabulous " phenotype is controlled by two independent genes, A and B, as shown in the diagram below. Allele A encodes a functional enzyme 1, which converts " lain " to " smashing ". The recessive allele a encodes a nonfunctional Enzyme 1. Allele B encodes a functional Enzyme 2, which converts " smashing " to " fabulous ". The recessive allele B encodes a functional and B genes are both autosoaml and assort independently. A true-breeding " fabulous " father(AABB) mats with a true-breeding " pain " mother(aabb). One of the F_2 offspring from the parental cross described above then mates a " plain " individual with the genotype aaBB. Determine and list all possible gemotypes and corresponding phenotypes and proportions in the offspring of this cross. State the epistatic relationship in this example. Is this an example of dominant or recessive epistasis? What is the most likely mode of inheritance for the pedigree shown below?

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