Assume eight different strains of fly have been isolated,each shows a recessive white eye trait.Crosses are performed as follows (w)indicates white-eyed progeny, (R)indicates wild-type red eyes. $$\begin{array} { l l l l l l l l l }
& \mathrm { A } & \mathrm { B } & \mathrm { C } & \mathrm { D } & \mathrm { E } & \mathrm { F } & \mathrm { G } & \mathrm { H } \
\mathrm { A } & \mathrm { w } & \mathrm { w } & \mathrm { R } & \mathrm { R } & \mathrm { w } & \mathrm { R } & \mathrm { R } & \mathrm { w } \
\mathrm { B } & & \mathrm { w } & \mathrm { R } & \mathrm { R } & \mathrm { w } & \mathrm { R } & \mathrm { R } & \mathrm { w } \
\mathrm { C } & & & \mathrm { w } & \mathrm { w } & \mathrm { R } & \mathrm { R } & \mathrm { R } & \mathrm { R } \
\mathrm { D } & & & & \mathrm { w } & \mathrm { R } & \mathrm { R } & \mathrm { R } & \mathrm { R } \
\mathrm { E } & & & & & \mathrm { w } & \mathrm { R } & \mathrm { R } & \mathrm { w } \
\mathrm { F } & & & & & & \mathrm { w } & \mathrm { w } & \mathrm { R } \
\mathrm { G } & & & & & & & \mathrm { w } & \mathrm { R } \
\mathrm { H } & & & & & & & & \mathrm { w }
\end{array}$$
Based on these crosses,how many different genes are present and what strains have mutations in the same gene as does strain A?
A) 2,B,E,and H
B) 3,B,and C
C) 3,B,C,and H
D) 3,B,E,and H
E) 4,B,and H

Question

Assume eight different strains of fly have been isolated,each shows a recessive white eye trait.Crosses are performed as follows (w)indicates white-eyed progeny, (R)indicates wild-type red eyes. $$\begin{array} { l l l l l l l l l } 
& \mathrm { A } & \mathrm { B } & \mathrm { C } & \mathrm { D } & \mathrm { E } & \mathrm { F } & \mathrm { G } & \mathrm { H } \
\mathrm { A } & \mathrm { w } & \mathrm { w } & \mathrm { R } & \mathrm { R } & \mathrm { w } & \mathrm { R } & \mathrm { R } & \mathrm { w } \
\mathrm { B } & & \mathrm { w } & \mathrm { R } & \mathrm { R } & \mathrm { w } & \mathrm { R } & \mathrm { R } & \mathrm { w } \
\mathrm { C } & & & \mathrm { w } & \mathrm { w } & \mathrm { R } & \mathrm { R } & \mathrm { R } & \mathrm { R } \
\mathrm { D } & & & & \mathrm { w } & \mathrm { R } & \mathrm { R } & \mathrm { R } & \mathrm { R } \
\mathrm { E } & & & & & \mathrm { w } & \mathrm { R } & \mathrm { R } & \mathrm { w } \
\mathrm { F } & & & & & & \mathrm { w } & \mathrm { w } & \mathrm { R } \
\mathrm { G } & & & & & & & \mathrm { w } & \mathrm { R } \
\mathrm { H } & & & & & & & & \mathrm { w }
\end{array}$$
Based on these crosses,how many different genes are present and what strains have mutations in the same gene as does strain A?
A) 2,B,E,and H
B) 3,B,and C
C) 3,B,C,and H
D) 3,B,E,and H
E) 4,B,and H

Quizplus · Accepted Answer

Strains that produce white-eyed progeny when crossed with each other have mutations in different genes, while strains that produce red-eyed (wild-type) progeny when crossed have mutations in the same gene. Strains A, B, E, and H produce red-eyed progeny when crossed with each other, indicating they have mutations in the same gene. The pattern of crosses suggests there are three different genes involved across all strains: one gene for A, B, E, and H; another gene for C and D; and a third gene for F and G.

Assume Eight Different Strains of Fly Have Been Isolated,each Shows