Q. 3: 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 × aaBBc
(b) AaBBCC × AABbc
(c) AaBbCc × AaBbc
(d) AaBBCc × AaBBC
(e) AABbCc × AABbc
Q. 4: Given the inheritance pattern of coat color in rats described in Q 3, predict the genotyp
and
(a) 9/16 gray: 3/16 yellow: 3/16 black: 1/16 crea
(b) 9/16 gray: 3/16 yellow: 4/16 albin
(c) 27/64 gray: 16/64 albino: 9/64 yellow: 9/64 black: 3/64 cream
(d) 3/8 black: 3/8 cream: 2/8 albino
(e) 3/8 black: 4/8 albino: 1/8 cream
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