Question

Choose the correct answer from the alternatives given.
Consider a cross in which a trait is inherited by complete dominance. What percentage of the F2 from the mating of homozygous dominant and homozygous recessive individuals will possess the heterozygous genotype?

• A. 75 per cent
• B. 50 percent
• C. 25 percent
• D. 0 percent

Answer 1

The correct option is B 50 percent

When a trait shows complete dominance, the heterozygous offsprings will show the dominant phenotype. If a cross is carried out between the homozygous dominant and homozygous recessive individuals the F2 generation will have a genotypic ratio of 1:2:1 for homozygous dominant, heterozygous dominant and homozygous recessive respectively. So, the percentage of individuals showing the heterozygous genotype will be, 2/4 X 100 = 50%. So, the correct option is '50 percent'.