Wild type female Drosophila are mated to males from a true breeding
strain that carries loss of function mutations at for
w
,
st
and
bw
. What proportion
of the F
2
males
will have wild type eyes?
Wild type female Drosophila are mated to males from a true breeding strain that carries loss of function mutations at for w, st and bw. What proportion of the F_2 males will have wild type eyes? A) 1/32 B) 3/32 C) 9/32 D) 12/32 E) 18/32
Show transcribed image textWild type female Drosophila are mated to males from a true breeding strain that carries loss of function mutations at for w, st and bw. What proportion of the F_2 males will have wild type eyes? A) 1/32 B) 3/32 C) 9/32 D) 12/32 E) 18/32
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.
