A Dihybrid Testcross Is Made to Determine If Genes C

question 46

Multiple Choice

A dihybrid testcross is made to determine if genes C and D are linked.The results are shown in the table.
$\begin{array}{|l|c|r|}\hline \text { Parent genotypes: } & C c  D d \times c c d d & \\\hline & C c  D d & 222 \\\hline & C c  d d & 280 \\\hline \text { Progeny genotypes: } & c c  D d & 280 \\\hline & c c  d d & 218 \\\hline & & 1000 \\\hline\end{array}$
-What is a reasonable conclusion based on the chi-square analysis?

• A)There is a high probability that the deviation from the expected results is due chance.
• B)One can say with a high degree of confidence that genes C and D are linked.
• C)The analysis supports the null hypothesis.
• D)Genes C and D are most likely unlinked.

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