Question 3

(Multiple Choice)

A dihybrid testcross is made to determine if genes C and D are linked.The results are shown in the table.
 Parent genotypes: Ccnbsp;Dd×ccddCcnbsp;Dd222Ccnbsp;dd280 Progeny genotypes: ccnbsp;Dd280ccnbsp;dd2181000\begin{array}{|l|c|r|}\hline \text { Parent genotypes: } & C c &nbsp;D d \times c c d d & \\\hline & C c&nbsp; D d & 222 \\\hline & C c &nbsp;d d & 280 \\\hline \text { Progeny genotypes: } & c c &nbsp;D d & 280 \\\hline & c c &nbsp;d d & 218 \\\hline & & 1000 \\\hline\end{array} A dihybrid testcross is made to determine if genes C and D are linked.The results are shown in the table.   <span class= Parent genotypes: Ccnbsp;Dd×ccddCcnbsp;Dd222Ccnbsp;dd280 Progeny genotypes: ccnbsp;Dd280ccnbsp;dd2181000\begin{array}{|l|c|r|} \hline \text { Parent genotypes: } & C c &nbsp;D d \times c c d d & \\ \hline & C c&nbsp; D d & 222 \\ \hline & C c &nbsp;d d & 280 \\ \hline \text { Progeny genotypes: } & c c &nbsp;D d & 280 \\ \hline & c c &nbsp;d d & 218 \\ \hline & & 1000 \\ \hline \end{array} -The chi-square value is the sum for all progeny classes of (observed-expected)2/expected.Using the chi-square test for goodness of fit, calculate the chi-square value to test the null hypothesis that genes C and D are unlinked.What is the chi-square value? A)0 B)0.0576 C)10.8 D)14.4 E)cannot be determined" class="answers-bank-image d-block" loading="lazy" >
-The chi-square value is the sum for all progeny classes of (observed-expected)2/expected.Using the chi-square test for goodness of fit, calculate the chi-square value to test the null hypothesis that genes C and D are unlinked.What is the chi-square value?


A)0
B)0.0576
C)10.8
D)14.4
E)cannot be determined

Answer

D