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Punnett S Sq.

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QUESTION 1 PREVIOUSLY IN AN F1 x F1 cross of parents RrFf x RrFf the original assumption was that the two genes R and F assorted independently and also modelled that allele R was dominant over allele r and allele F was dominant over allele f, what would thephenotype(s) of the F1 generation be? Ans: (Answered considering that yellow is dominant over red and spiky is dominant over soft.) F1 generation having genotype RrFf is spiky yellow fur considering that yellow is dominant over red and spiky is dominant over soft. When we cross RrFf x RrFf considering the original assumption, we get a phenotypic Ratio of F2 generation of 9:3:3:1 i.e 9 spiky yellow fur, 3 soft yellow fur, 3 spiky red and 1 soft red fur. THE DATA GIVEN WAS A collaborator is working with the same organism and follows your protocol to produce a F2 population. They OBSERVED the following: 13 individuals with soft, red fur 37 individuals with spiky, red fur 40 individuals with soft, yellow fur 110 individuals with spiky, yellow fur YOUR ORIGINAL CHI SQUARE ANALYSIS led to the conclusion that this model generated by the assumptions given could not be accepted i.e., the calculated chi square was significantly greater than the critical value of 7.815 QUESTION: What changes would you make to the hypothesized model that would support the observed data? Use Chi square analysis to verify . Ans: Now consider that instead of 9:3:3:1 phenotypic ratio we get phenotypic 8.5:2.8:3.4:1 ratio. Using a Chi-square test, you wil ...
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