In Flower Beetles, Pygmy (Py) Is Recessive to Normal Size

question 31

Multiple Choice

In flower beetles, pygmy (py) is recessive to normal size (py⁺) , and red color (r) is recessive to brown (r⁺) . A beetle heterozygous for these characteristics was test-crossed to a beetle homozygous for pygmy and red. The following are progeny phenotypes from this testcross. $$\begin{array} { l l r } p y ^ { + } & r ^ { + } & 180 \\p y ^ { + } & r & 22 \\p y & r ^ { + } & 19 \\p y & r & 191 \\\text { Total } && 412\end{array}$$ Carry out a series of chi-square tests to determine if the two loci are assorting independently.
-What is the correct chi-square value and how many degree(s) of freedom should be used in its interpretation?

• A) 112 with one degree of freedom
• B) 265 with three degrees of freedom
• C) 367 with four degree of freedom
• D) 16.5 with three degrees of freedom
• E) 367 with three degrees of freedom

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