In mice a certain gene is involved with pigment production. Allele C is dominant
ID: 53079 • Letter: I
Question
In mice a certain gene is involved with pigment production. Allele C is dominant and results in colored fur. Allele c is recessive and causes albino fur. A second, unlinked locus controls fur color. Y produces yellow color; y produces agouti color. Y / y mice have yellow fur, but Y is recessive lethal.
Use this information to answer the following questions:
a. When yellow mice are crossed with albino mice, they produce an F1 consisting of ½ albino, 1/3 yellow, and 1/6 agouti. What are the probable genotypes of the parents?
b. If yellow F1 mice from part a are intercrossed, what proportions of offspring would be produced.
Explanation / Answer
a). Probable Genotype of parent: CcYy x ccYy
Genotype of F1:
from the above table we can see there are 8 albino,6 yellow and 2 agouti mice which corresponds to the above given data that is ½ albino, 1/3 yellow, and 1/6 agouti.
b).When F1 mice are intercrossed then, suppose we crossing yellow mice and albino mice from F1,then
F2 Genotype: CcYY X ccYy
From the above table we can see F2 generation produces 8 yellow and 8 albino mice.So the proportion is 1/2 yellow and 1/2 albino mice.
CY cY cy Cy cY CcYY ccYY ccYy CcYy cy CcYy ccYy ccyy Ccyy cY CcYY ccYY ccYy CcYy cy CcYy CCYy ccyy CcyyRelated Questions
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