A mouse with grey hair mates with a mouse with white hair, producing offspring with genotypes Bb, Bb, bb and bb. (B is the dominant allele for grey hair, and b is the recessive allele for white hair.) Which statement correctly describes the genotypes of the parents?
- Aboth heterozygous
- Bboth homozygous dominant
- Cone heterozygous and one homozygous dominant
- Done heterozygous and one homozygous recessive