Give the phenotypic ratio of the f1 and f2 generations

In guinea pigs, the gene for production of melanin is epistatic to the gene for the deposition of melanin. The dominant allele Mcauses melanin to be produced; mm individuals cannot produce the pigment. The dominant allele B causes the deposition of a lot ofpigment and produces black guinea pig, whereas only a small amountof pigment is laid down in bb animals, producing a light browncolor. Without an M allele, no pigment is produced so the allele Bhas no effect and the guinea pig is white. A homozygous blackguinea pig is crossed with homozygous recessive white: MMBB x mmbb. Give the phenotypic ratio of the F1 and F2 generations.

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