Question

Any monohybrid cross consisting of one dominant and one recessive allele for the trait studied should result in a ratio of ______________ dominant to __________________ recessive.

A. three; one
B. one; one
C. one; two
D. two; one
E. one; three

Answer 1

The correct answer to the question of the expected ratio in any monohybrid cross of one dominant and one recessive allele is three dominant to one recessive, which is answer A.

Step-by-step explanation:

Any monohybrid cross consisting of one dominant and one recessive allele for the trait studied should result in a ratio of three dominant to one recessive. This result can be derived from Gregor Mendel's classic monohybrid cross experiments, which demonstrated that when two individuals that each have one dominant and one recessive allele (heterozygous) for a trait are crossed, the offspring exhibit the phenotypes of the dominant trait and the recessive trait in a 3:1 ratio. This occurs because homozygous dominant and heterozygous individuals are phenotypically identical when it comes to dominant traits.

The correct answer to the student's question is A. three; one.