2. Mendel's Laws of Inheritance
Dihybrid Cross
4:24 minutes
Problem 17d
Textbook Question
Textbook QuestionIn 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: AAbbCC×aaBBcc
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