Question

In fruit flies, eyes can be either white or red, and wings can be either long or short. A mating cross between a red-eyed long-winged female and a red-eyed short-winged male produces the following offpsring:



42 red, short

30 red, long

14 white, short

10 white, long


Calculate the chi-squared value for the null hypothesis that the red-eyed long-winged female was heterozygous for the long-wing gene. Express your answer as a decimal rounded the nearest hundredth.