Question

Shank color in chickens is determined by a single gene with two alleles, D and d. Chickens of genotype DD or Dd have white shanks, while chickens of genotype dd have yellow shanks.

Egg color in chickens is controlled by another single gene. True breeding araucana chickens (whose genotype is designated by EAEA) lay blue eggs. True breeding moron chickens (genotype EMEM) lay brown eggs. A hybrid between araucana and moron (genotype EAEM) lays green eggs.

You cross a true breeding yellow shank araucana to the true breeding white shank moron. You then cross the F1 chickens to a hybrid with yellow shanks.

Here are the results:

Phenotype	Number
Yellow shanks, lays blue eggs	110
White shanks, lays blue eggs	95
Yellow shanks, lays green eggs	206
White shanks, lays green eggs	198
Yellow shanks, lays brown eggs	94
White shanks, lays brown eggs	97

1. State your null hypothesis.

2. Perform a chi-squared analysis to test the independent assortment of these two traits.

3. What p-value does this correspond to? Do you reject or fail to reject the null hypothesis?

4. Write a brief sentence interpreting the p-value.