Yellow mice possess a dominant effect allele at the gene locus that controls coa
ID: 65638 • Letter: Y
Question
Yellow mice possess a dominant effect allele at the gene locus that controls coat color that is lethal when homozygous Let Y = yellow, dominant, and y = agouti recessive All yellow mice have a genotype of Yy at this locus There is also a gene "C" that controls whether the coat color gene can even be expressed. Let C = pigment production, dominant, and c = no pigment production (or albino) Thus, a yellow mouse would have to have a genotype of C_Yy Also, an albino moose could be homozygous YY because the recessive cc genotype prevents the coat color locus from expressing at all. An albino mouse is crossed with a pure bred agouti mouse and aft F1 offspring are yellow mice What are the genotypes of the two parents and the F1 offspring? What phenotypic ratio is expected from the cross of two F1 yellow mice?Explanation / Answer
Based on the data, if a mice has
Here, an albino mouse crossed with purebred agouti mouse, the cross is as follows:
Therefore,
a)
The genotypes of parents are:
The genotype of F1 is:
b)
The phenotypic ratio is expected from the cross of two F1 mice is as follows:
Thus, the ratio is: 9: 3: 4.
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