Question

Both male and female rats have genotype Bb. Based on the Punnett square, Carol concluded that the phenotypic ratio of the monohybrid cross is 2:1:1. What mistake did Carol make?
A) The ratio should be 2:1
B) The ratio should be 3:1
C) The ratio should be 2:1:1
D) The ratio should be 1:1:1:

Answer 1

Answer: B) The ratio should be 3:1

Explanation: The genotypes of the offsprings from a monohybrid cross between a male and female rat with genotype Bb will produce 2 Bb, 1 BB and 1 bb. Phenotypically, Bb and BB will manifest outwardly as dominant while Bb will appear as recessive trait. Therefore, the phenotypic ratio is 3:1

See the attached punnet for the cross

Answer 2

Answer: The Answer is B/3:1