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Suppose you discover a new eye color mutation in Drosophila. You cross a blue-eyed female fly with a male from Cy/Pm; Tb/Sb tester stock. The F1 are all wild type for eye color. Curly, tubby, F1 flies (males) are selected and backcrossed to the blue-eyed females. The following progeny are obtained:

192 curly, tubby 191 curly, blue

187 tubby 189 blue

On which chromosome is the blue eye gene located?

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Related questions

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 (remember that there is no crossing over in Drosophila males):

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:

60 females, 65 males

Blue eyes, spineless, vestigial:

62 females, 58 males

a. Is the mutation dominant or recessive? Explain.

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.

Can someone please help me solve this problem?

I am completely lost on this. I am having a hard time with finding the linkage with blue eyes and others.

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.

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 from the above progeny. Show your work

Drosophila has four pairs of chromosomes: the sexchromosomes (XX in the females; XY in the males) and three pairs ofautosomes. You are studying a new mutant strain with blue eyes. Youwish to know if blue eye colour is a dominant mutation and on whichchromosome the blue eye locus can be found. When you crossa pure‐breeding female blue‐eyed fly with vestigial wings andspineless bristles to a male fly with wild type eye colour, wings,and bristles, all of the F1 progeny are completely wild type. An F1male is backcrossed to a triple mutant female, producing thefollowing progeny (remember that there is no crossing over inDrosophila males):

Wild type eyes, wings, andbristles: 72 females, 69 males

Wild type eyes and bristles,vestigial: 83 females, 77 males

Wild type wings, blue eyes,spineless: 60 females, 65 males

Blue eyes, spineless,vestigial: 62 females, 58males

Is the mutation dominant or recessive?Explain.

Since you know that the locus for vestigial wings is onchromosome 2 and the locus for spineless bristles is on chromosome3, what chromosome carries the locus for blue eyes? Showyour work, including the step‐by‐step reasoning you used to arriveat your answer.

When an F1 female is backcrossed to a triple mutant male, thefollowing 1,000 progeny are produced:

Wild type eyes, wings, andbristles: 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, blueeyes: 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, blueeyes: 33 females, 37 males

Blue eyes, spineless,vestigial: 90 females, 85 males

Calculate the map distance betweenblue eye and any linked genes. Show your work

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