Question

In a monohybrid cross, the genotypic ratio of the offspring in $F_2$ generation is

• A. 3:1
• B. 1:2:1
• C. 1:1:1:1
• D. 4:0

Answer 1

Answer: (B)

1:2:1

A monohybrid cross is a mating between individuals who have different alleles at one genetic locus of interest. In a monohybrid cross, the pure breed tall and dwarf homozygous plants were crossed.
Genotype: TT X tt
Gametes: T t
Offspring: Tt

Selfing of F${}_1$; F${}_2$: Tt X Tt
Gametes: T, t T, t
F${}_2$ generation: TT, Tt, Tt and tt
Genotypic ratio: 1: 2:1