8 points Save A A colony of mice with gray fur has boen bred in your laboratory

Question

8 points Save A A colony of mice with gray fur has boen bred in your laboratory for sx years, All had gray hur A male mouse is bom with white fur. You are curious, so you cross In the first generation, you observe 16 gray females, 14 gray males, 15 white females and 14 white males From this pattern of inheritance, what would be your guess about the genetie nature of tho white tr the white mouse to a few of the gray fur females from the colony oit? Is it likely to be due to a mutation in a single gene? What's your evidence for or against your answer? (1 point) What is the nature of the allele? Dominant? Recessive? Why do you reach this conclusion? (1 pont What can you say about the genotype of the different colors of mice? (You may invent the name of the alleles Next, let's consider what would happen if you set up matings between the Fi progeny What would you see (phenotype and genotype) in the F2 for two gray Ft mice? (2 points) What would you see in the F2 (phenotype and genotype) for two white mice(3 points) thom for your instructor) (1 point)

Explanation / Answer

1)As per the observations, it is more likely, that the genetic nature of the white trait could be recessive. Assuming, the genotype of the gray fur to be Cc, as per the Law of Dominance all the generations had gray fur i.e the dominant trait expressed. So, may be there would have been any mutation in any gene that could have led to the expression of the recessive white trait, i.e, cc. Furthermore, the crosses with white and gray fur have caused almost equal expression of both genes, supporting the fact that some mutation could have caused the recessive trait expression.

2) The nature of allele is Recessive. Since for the majority of generations, there wasn't any sign of white mice, it is clear that it was not able to express itself due to the dominant gray fur genes.

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