In a dihybrid cross between two plants, one with genotype AaBb and the other with genotype Aabb, what fraction of the offspring will be expected to show the dominant phenotype for both traits?
Practice Questions
1 question
Q1
In a dihybrid cross between two plants, one with genotype AaBb and the other with genotype Aabb, what fraction of the offspring will be expected to show the dominant phenotype for both traits?
1/4
1/2
3/4
1/8
The cross AaBb x Aabb results in 1/4 AABB, 1/4 AABb, 1/4 AaBb, and 1/4 Aabb. Only AABB, AABb, and AaBb show the dominant phenotype for both traits, which is 3 out of 8, hence 3/8.
Questions & Step-by-step Solutions
1 item
Q
Q: In a dihybrid cross between two plants, one with genotype AaBb and the other with genotype Aabb, what fraction of the offspring will be expected to show the dominant phenotype for both traits?
Solution: The cross AaBb x Aabb results in 1/4 AABB, 1/4 AABb, 1/4 AaBb, and 1/4 Aabb. Only AABB, AABb, and AaBb show the dominant phenotype for both traits, which is 3 out of 8, hence 3/8.
