Question

question 4
2 pts
the allele for white hair in mice is autosomal recessive (b), while the allele for black hair is autosomal dominant (b). a white, female mouse mates with a black, male mouse. what are the possible genotypes for the white, female mouse?
bb or bb
bb only
bb only
bb only
question 5
2 pts
the allele for white hair in mice is autosomal recessive (b), while the allele for black hair is autosomal dominant (b). a white, female mouse mates with a black, male mouse. if the offspring are half black and half white, what are the possible genotypes for the black, male mouse?
bb or bb
bb only
bb only
bb only

Explanation:

Question 4

Since white - hair is an autosomal recessive trait, for an individual to express the white - hair phenotype, it must have two recessive alleles.

The white female mouse has a genotype of bb. If the offspring are half black and half white, the black male mouse must be heterozygous (Bb) so that when crossed with bb, half of the offspring get the dominant B allele (black) and half get the recessive b allele (white).

Answer:

D. bb only

Question 5