In fruit flies, the phenotype for eye color is determined by a certain locus. E indicates the dominant allele and e indicates the recessive allele. The cross between a male wild-type fruit fly and a female white-eyed fruit fly produced the following offspring.

Wild-type male--Wild-type female--White eyed male--White eyed fem.--brown-eyed fem.
F1 0 45 55 0 1

The wild-type and white-eyed individuals from the F1 generation were then crossed to produce the following offspring

F2 23 31 22 24 0


(A) Determine the genotypes of the original parents (P generation) and explain your reasoning. You may use Punnett squares to enhance your description, but results must be discussed.
(B) Use a Chi-squared test on the F2 generation data to analyze your prediction of the parental genotypes. Show all your work and explain the importance of your final answer.
(C) The brown-eyed female in F1 generation resulted from a mutational change. Explain what a mutation is and discuss two types of mutations that might have produced the brown-eyed female in the F1 generation


If you could answer these questions or give me tips on what to write about in this essay. That would be great. Thank you so much. :)

What part are you stuck on exactly?

I'm pretty much completely lost. I don't get the chi-squared test at all though