Question

Which of the following is the genotypic ratio of monohybrid cross?

• A. 1 : 2 : 1
• B. 9 : 7
• C. 1 : 2
• D. 9 : 3 : 3 : 1

Answer 1

Answer: (A)

A monohybrid cross is a mating between two individuals with different alleles at one genetic locus of interest.

The expected genotype ratio when two heterozygotes are crossed is 1 (homozygous dominant) : 2 (heterozygous) : 1 (homozygous recessive).

Parents- Tt x Tt

Gametes- T, t T, t

Offspring- TT, Tt, Tt and tt

Phenotype- Tall, Tall, Tall and Dwarf

Genotypic Ratio- 1 : 2 : 1

Phenotypic ratio- 3 : 1