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27 Nov 2019

In chickens, the beaks can be yellow, blue and green. Chickens with green beaks have an increased value. What is the type of dominance in this problem?

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Related questions

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.

In chickens, the creeper trait is a semi-lethal dominant allele that results in shortened legs, so that the chickens must creep along. Creepers are heterozygous for the allele. Yet, in the homozygous state the allele is lethal and embryos do not develop to hatching. Times are hard, and you must breed your creeper chickens for offspring to sell. If you mate two creeper chickens, and they produce 45 eggs that hatch, on average how many of those chicks would you expect to be normal, not creepers? Unhatched eggs are not included in the 45.

Andalusian chickens exhibit three colors; black, white, and blue. The gene controlling color has two alleles. When a true-breeding black Andalusion chicken is crossed with a true-breeding white Andalusion chicken, all offspring are blue.

What is the relationship between the two alleles controlling color? [ Select ] ["incomplete dominance", "codominance", "complete dominance"]
What color(s) and in what ratios would you expect if you crossed 2 blues? [ Select ] ["1 black : 2 blue : 1 white", "1 black : 1 blue", "1 black : 1 blue : 1 white", "9 black : 3 blue : 4 white", "all blues", "all whites", "all blacks", "1 white : 1 blue"]
What color(s) and in what ratios would you expect if you crossed a blue and a white?

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