Two members of our class, X-Gal, and X-Gal Pal, have decided to start a mouse fa

Question

Two members of our class, X-Gal, and X-Gal Pal, have decided to start a mouse farm.   They obtain two strains of mice, each true-breeding for fur color (strain 1 is black, and strain 2, white). Allele B is for black and allele b for white are on an autosome.   They mate the strains with each other and the F1 generation has grey fur.   The F1 generation mates with each other and the following results are observed in the F2 generation : 27 black, 48 grey and 24 white mice.    X-Gal and X-Gal Pal are a bit surprised, but they resort to the awesome genetics skills they have learned somewhere and they resolve to impose order in this chaos.

____________________________: (1 pt) What type of gene action is a reasonable choice for these observations? (‘gene action’ means recessive, dominant, codominant, incomplete dominance, and various types of epistasis)

(2 pts ). Briefly, but legibly describe the steps you would take to determine the type of gene action that most logically accounts for the relationship between the genotypes and the phenotypes observed at this farm. Make sure that your answer clearly describes how and why the steps you propose lead to a clear resolution of this mess:

Explanation / Answer

A cross between two F1 hybrids, heterozygous for a single trait displaying incomplete dominance is predicted to produce both phenotypes and genotypes in the ratio of 1:2:1.

Therefore, Incomplete dominance is responsible for these observations.

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