Question

According to Mendel in a monohybrid cross, the genotypic ratio of $F_2$ generation is

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

Answer 1

The correct option is D

$1:2:1$

The correct option is D:

Explanation of correct option:

Monohybrid:

1. A cross that involves two parents that differ in only one trait is called a monohybrid cross.
2. For example- the inheritance of tall and dwarf characters is said to be a monohybrid cross.

Genotype:

1. "Genotype" refers to the genetic makeup of an organism.
2. In a monohybrid cross- the phenotype ratio is 3:1 while the genotype ratio is 1:2:1.

Explanation of incorrect option:

Option A:

The genotypic ratio in the monohybrid cross is 3:1.

Option B:

The phenotypic ratio in dihybrid cross is 9:3:3:1

Option C:

The ratio of test cross is 1:1

Final answer: According to Mendel, in a monohybrid cross, the genotypic ratio of $F_2$ generation is 1:2:1