I\'m having a rough time doing this homework questions: In guinea pigs, the gene

Question

I'm having a rough time doing this homework questions:

In guinea pigs, the gene for production of melanin is epistatic tothe gene for the deposition of melanin. The dominant allele Mcauses melanin to be produced; mm individuals cannot produce thepigment. 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.

Explanation / Answer

   MMBB x mmbb yields the phenotype of100% all black in the F1 In the F2 you cross MmBb x MmBb and your phenotype wouldbe 9/16 Black 3/16 brown 4/16 no pigment hope this helps

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