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

question 11

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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. py+r+180py+r22pyr+19pyr191 Total 412\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 there is equal segregation of alleles at the py locus.
- What is the correct chi-square value and how many degree(s) of freedom should be used in its interpretation?

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