Answer: See below
Step-by-step explanation:
The Male P1 Mouse: BB
The Female P1 Mouse: bb
The first photo shows the genotype of the F1 generation, they are now heterozygous because they contain different alleles (Bb).
The black B is the dominant trait so they will all be black because they all have that B allele.
The second photo shows the F2 generation and shows that one of the four offspring would have bb which would be white while all others will be black.