Females heterozygous for the recessive second chromosome mutations px, sp, and cn are mated to a male homozygous for all three mutations.The offspring are as follows:
$\begin{array}{|l|r|}
\hline p x s p c n & 1461 \
\hline p x s p c n^{+} & 3497 \
\hline p x s p{+ c n} & 1\
\hline p x s p^{+} c n+ & 11 \
\hline p x^{+} s p c n & 9 \
\hline p x^{+} s p c n+ & 0 \
\hline p x^{+} s p+ c n & 3483 \
\hline p x^{+} s p+ c n+ & 1539 \
\hline & 10,000 \
\hline
\end{array}$
-Which of the three genes is in the middle?
A)px
B)sp
C)cn
D)insufficient data

Question

Females heterozygous for the recessive second chromosome mutations px, sp, and cn are mated to a male homozygous for all three mutations.The offspring are as follows:
 $\begin{array}{|l|r|}
\hline p x  s p  c n & 1461 \
\hline p x  s p  c n^{+} & 3497 \
\hline p x  s p{+ c n} & 1\
\hline p x  s p^{+}  c n+ & 11 \
\hline p x^{+}  s p  c n & 9 \
\hline p x^{+}  s p  c n+ & 0 \
\hline p x^{+}  s p+ c n & 3483 \
\hline p x^{+}  s p+ c n+ & 1539 \
\hline & 10,000 \
\hline
\end{array}$
-Which of the three genes is in the middle?
A)px
B)sp
C)cn
D)insufficient data

Quizplus · Accepted Answer

The Answer of Females heterozygous for the recessive second chromosome mutations px, sp, and cn are mated to a male homozygous for all three mutations.The offspring are as follows:
 $\begin{array}{|l|r|}
\hline p x  s p  c n & 1461 \
\hline p x  s p  c n^{+} & 3497 \
\hline p x  s p{+ c n} & 1\
\hline p x  s p^{+}  c n+ & 11 \
\hline p x^{+}  s p  c n & 9 \
\hline p x^{+}  s p  c n+ & 0 \
\hline p x^{+}  s p+ c n & 3483 \
\hline p x^{+}  s p+ c n+ & 1539 \
\hline & 10,000 \
\hline
\end{array}$
-Which of the three genes is in the middle?
A)px
B)sp
C)cn
D)insufficient data

Females Heterozygous for the Recessive Second Chromosome Mutations Px, Sp