In rats, the following genotypes of two independently assorting autosomal genes determine coat color:
A−B− | (gray) |
A−bb | (yellow) |
aaB− | (black) |
aabb | (cream) |
A third gene pair on a separate autosome determines whether or not any color will be produced. The CC and Cc genotypes allow color according to the expression of the A and B alleles. However, the cc genotype results in albino rats regardless of the A and B alleles present. Determine the F1 phenotypic ratio of the following crosses:
(a) AAbbCC × aaBBcc
(b) AaBBCC × AABbcc
(c) AaBbCc × AaBbcc
(d) AaBBCc × AaBBCc
(e) AABbCc × AABbcc
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