A true-breeding pink-body unicorn with a red horn was crossed with a true-breedi

Question

A true-breeding pink-body unicorn with a red horn was crossed with a true-breeding white-bodied, purple horned unicorn. Pink body and purple horns are dominant.

A) What phenotypic ratio do you expect for F1? For the F2 generation, you end up with the following unicorn offspring: 175 pink-bodied and purple horned, 65 pink-bodied and red horned, 55 white-bodied and purple horned, and 20 white bodied and red horned. Test the hypothesis that the genes associated with unicorn body and horn color are assorting independently.

B) What is your chi-square value?

C) Now assume that your chi-square value exceeds the chi-square critical value. Does this mean you reject or fail to reject your null hypothesis.

D) Now assume that you failed to reject your null hypothesis, does this mean the two genes are independently assorting or that linkage is occurring?

Explanation / Answer

In generic studies phenotype is a common term. It is associated with punnett squares. These are diagrams used to assist people to determine the phenotypes of a genetic cross.

For the F2 generation the are 175 pink bodied and purple horned unicorn offsprings, 65 pink bodied and red horned, 55 white bodied and purple horned, 20 white bodied and red horned unicorn offsprings are assorting independently.

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