Biology, 12.01.2021 18:00 toxsicity

In fruit flies, vestigial wings are recessive to normal wings, and ebony body is recessive to normal body. A cross was made between flies (all true-breeding) with normal wings and normal bodies to flies with vestigial wings and ebony bodies. The F1 offspring were then self-crossed to produce an F2 generation. The following data were obtained (observed): Category Predicted ratio Observed numbers
normal wings, normal body 9 452
normal wings, ebony body 3 126
vestigial wings, normal body 3 101
vestigial wings, ebony body 1 41
720

Given that we would expect equal proportions of each class of flies after a testcross, test the goodness of fit using a chi-square test. What is the chi-squared value for this set of data?

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In fruit flies, vestigial wings are recessive to normal wings, and ebony body is recessive to normal...