Biology for IGCSE & O level - Inheritance (Section 4 - No. 11)
In a monohybrid cross, what is the expected phenotypic ratio in the F2 generation when both parents are heterozygous for a single trait (assuming complete dominance)?
3:1
1:2:1
9:3:3:1
1:1
Explanation
The 3:1 ratio represents the appearance of the dominant trait in approximately three-quarters of the offspring and the recessive trait in one-quarter.