Q. 1: Given the inheritance pattern of coat color in rats described in Q 3, predict the genotype and phenotype of the parents who produced the following offspring: (a) 9/16 gray: 3/16 yellow: 3/16 black: 1/16 cream (b) 9/16 gray: 3/16 yellow: 4/16 albino (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 Q. 2: 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
Q. 1: Given the inheritance pattern of coat color in rats described in Q 3, predict the genotype
and
(a) 9/16 gray: 3/16 yellow: 3/16 black: 1/16 cream
(b) 9/16 gray: 3/16 yellow: 4/16 albino
(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
Q. 2: 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
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