The white cat is the recessive allele w, while the black cat is the dominant allele B. However, in the f1 generation, the dominant allele concealed the recessive features, but they are heterologous dominant, i.e. BBww in f2 second filial generation: Bw x Bw.
There are three black kittens and one white kitten when f2 second filial generation offspring are crosslets. Consider the genotype of white cat WW and black cat as BB in the first generation as it's given in question all the offspring of f1 generation are black giving a hint that black is dominant over white.
Now genotype of f1 offspring is wB now in the second filial generation where 2 offspring of f1 crossed the resultant offspring is 3 black kittens and 1 white kitten. second filial generation is the second filial generation of the offspring produced by inbreeding F1 people, whereas F1 generation refers to the first filial generation of the offspring from the parents. hence, the results are BB, Bw, Bw, and ww.
To learn more about f2 generation:
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