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During winter break, you start breeding reindeer. You have two unique true-breeding varieties of reindeer, and both have black noses. When you cross the two varieties together, the F1 generation also has black noses. To your surprise, when you obtain the F2 generation, you count 128 black-nosed reindeer and 32 red-nosed reindeer.

1. State a genetic hypothesis that describes this inheritance pattern. Describe what genotypes correspond to what phenotypes in your answer.

2. What were the genotypes of the original parent reindeer and the genotype of the F1?

3. Show that the F2 results you obtained are consistent with your genetic hypothesis by performing a chi-square test. Show your work.

Answer :

Final answer:

The inheritance pattern is most likely due to codominance, where both alleles for nose color are expressed in the F1 generation. The F2 results suggest a 3:1 phenotypic ratio, consistent with Mendelian inheritance. A chi-square test can be used to confirm the consistency between observed and expected values.

Explanation:

The inheritance pattern described in the question is most likely due to codominance, where both alleles for nose color (black and red) are expressed in the F1 generation. The genetic hypothesis can be stated as having two alleles for nose color, with the black-nosed reindeer having the genotype BB, the red-nosed reindeer having the genotype RR, and the F1 reindeer having the genotype BR. In the F2 generation, the results suggest a 3:1 phenotypic ratio, consistent with Mendelian inheritance.

Based on the results, the genotypes of the original parent reindeer would be BR since they had black noses. The genotype of the F1 reindeer would also be BR because both alleles are expressed.

To show that the F2 results are consistent with the genetic hypothesis, a chi-square test can be performed. The observed values would be 128 black-nosed reindeer and 32 red-nosed reindeer, and the expected values would be 144 black-nosed reindeer and 16 red-nosed reindeer (expected based on a 3:1 phenotypic ratio). The chi-square test can then determine if the observed and expected values are significantly different.

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