In mice, the allele C for colored fur is dominant over the allele c for white fu

Question

In mice, the allele C for colored fur is dominant over the allele c for white fur, and the allele V for normal behavior is dominant over the allele v for waltzing behavior, a form of discoordination. Give the genotypes of the parents in each of the following crosses. (Hint: list the phenotypes and number of the progeny and look at their ratios. Look at the C separately from the V).

Colored, normal mice mated with white, normal mice produced 29 colored, normal and 10 colored, waltzing progeny. (3 pt) _Genotypes of the parents are __

Colored, normal mice mated with colored, normal mice produced 38 colored, normal, 15 colored, waltzing, 11 white, normal and 4 white, waltzing progeny. (3 pt) _ Genotypes of the parents are ____

Colored, normal mice mated with white, waltzing mice produced 8 colored, normal, 7 colored, waltzing, 9 white, normal, and 6 white, waltzing progeny. (3 pt) _ Genotypes of the parents are ____

Explanation / Answer

Colored normal (C_, V_) mice mated with white normal (cc,V_) mice. Offsprings produced are 29 colored normal and 10 colored waltzing progeny. All the offsprings are normal. So, the genotype of first parent should be CC. Waltzing trait is produced. So, the V gene should be heterozygous in both traits. The genotypes of the parent should be (CC,Vv) and (cc,CV).

The offsprings are produced in the ratio of 9:3:3:1. So, the genotypes of the parents are (Cc,Vv) and (Cc,Vv).

The offsprings are produced approximately in the ratio 1:1:1:1. So, the genotypes of the parents are (Cc,Vv) and (cc,vv).

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