i need full details as answers so that i can understand Drosophila has four pair

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i need full details as answers so that i can understand


Drosophila has four pairs of chromosomes: the sex chromosomes (XX in the females; XY in the males) and three 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 of 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, and 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? Explain.
The mutation is recessive because the F1 progeny produced only wildtype indicating that the mutants are recessive to the wildtype.
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? Show your work, including the step-by-step reasoning you used to arrive at your answer.

c. When an F1 female is backcrossed to a triple mutant male, the following 1,000 progeny are produced:
wild type eyes, wings, and bristles: 90 females, 89 males
wild type eyes and bristles, vestigial: 83 females, 98 males
wild type eyes and wings, spineless: 37 females, 35 males
wild type wings and bristles, blue eyes: 36 females, 34 males
wild type wings, blue eyes, spineless: 92 females, 88 males
wild type eyes, spineless, vestigial: 34 females, 39 males
wild type bristles, vestigial, blue eyes: 33 females, 37 males
blue eyes, spineless, vestigial: 90 females, 85 males
Calculate the map distance between blue eye and any linked genes. Show your work.

Explanation / Answer

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

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