A corn plant known to be hybrid for three linked genes is testcrossed.The progeny phenotypes and frequencies are: $$\begin{array} { | l | l | }
\hline + + + & 74 \
\hline a b c & 70 \
\hline a + + & 44 \
\hline + b c & 50 \
\hline + + c & 4 \
\hline a b + & 2 \
\hline a + c & 368 \
\hline + b + & 388 \
\hline
\end{array}$$
The coefficient of coincidence in this genomic region is:
A)0.06.
B)0.15.
C)0.40.
D)0.44.
E)1.36 .

Question

A corn plant known to be hybrid for three linked genes is testcrossed.The progeny phenotypes and frequencies are: $$\begin{array} { | l | l | } 
\hline + + + & 74 \
\hline a b c & 70 \
\hline a + + & 44 \
\hline + b c & 50 \
\hline + + c & 4 \
\hline a b + & 2 \
\hline a + c & 368 \
\hline + b + & 388 \
\hline
\end{array}$$
 The coefficient of coincidence in this genomic region is:
A)0.06.
B)0.15.
C)0.40.
D)0.44.
E)1.36 .

Quizplus · Accepted Answer

The coefficient of coincidence is calculated as the ratio of observed double crossovers (6) to expected double crossovers. The expected double crossovers are calculated using the product of the recombination frequencies between the genes. The observed double crossovers are 6 (4 + 2), and the expected is 15. Therefore, the coefficient of coincidence is 6/15 = 0.40.

A Corn Plant Known to Be Hybrid for Three Linked