This is the question I\'m working on: Drosophila has 4 pairs of chromosomes:the

Question

This is the question I'm working on:
Drosophila has 4 pairs of chromosomes:the sex chromosomes and 3 pairs of autosomes. You are studying a new mutant strain with blue eyes. You wish to know if blue eye colour is a dominant mutation and on which chromosome the blue eye locus can be found. When you cross a pure-breeding female blue eyed fly with vestigial wings and spineless bristles to a male fly with wild type eye colour, wings, and bristles, all the F1 progeny are completely wild type. An F1 male is backcrossed to a triple mutant female, producing the following progeny:
wild type eyes, wings, bristles 72 females, 69 males
wild type eyes and bristles, vestigial 83 females, 77 males
Wild type wings, blue eyes, spineless 52 females, 43 males
blue eyes, spineless, vestigial 62 females, 58 males.
a. Is the mutation dominant or recessive?
b. Since you know that the locus for vestigial wings is on chromosome 2 and the locus for spineless bristles is on chromosome 3, what chromosome carries the locus for blue eyes?

Explanation / Answer

a. This mutation is recessive, if dominant majority of the males and female would get the mutant phenotype.

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