In mice, the black body coloration A dominates over the brown a. The tail length is controlled by the gene

In mice, the black body coloration A dominates over the brown a. The tail length is controlled by the gene, the dominant allele of which, being in the homozygous state (BB), determines the development of the tail of normal length, and the homozygote for the recessive allele (bb) is lethal. If this gene is in a heterozygous state (Bb), then mice have truncated tails. What offspring, and in what proportion can be expected from crossing individuals with the following genotypes AABb and AaBb.

Given:
black – A
brown – a
normal – BB
shortened Bb
death – bb

Decision:
R: AABb x AaBb
G: AB; Ab x AB; Ab; aB; ab
F: AABB (h, n); AABb (h, y); AaBB (h, n); AaBb (h, y);
AABb (h, y); AAbb (d); AaBb (h, y); Aabb (r)

phenotype ratio: 2: 4
genotype ratio: 1: 2: 1: 2