Question

Statement 1: In $F_2$ generation of a monohybrid cross, the ratio of visible traits in offspring= 3:1
Statement 2: In $F_2$ generation of a monohybrid cross, both visible parental traits are expressed in the ratio of 3:1.
Choose the correct option.

• A. Both the statements are correct
• B. Statement 1 is correct and statement 2 is incorrect
• C. Statement 1 is incorrect and statement 2 is correct
• D. Both the statements are incorrect

Answer 1

The correct option is A Both the statements are correct

A monohybrid cross is a mating between two individuals with different alleles at one genetic locus of interest. When two pure breeding varieties are crossed, it results in the first hybrid generation, which is known as first filial progeny or $F_1$ generation. Offspring produced by the crossing of individuals from $F_1$ generation represent the $F_2$ generation.
For example, in a cross between true-breeding tall plant and true breeding dwarf plant, the $F_1$ plants obtained are all tall. although they contain the genetic component of the dwarf but it gets masked and which is again expressed in the $F_2$ generation. When the $F_1$ plants are self-pollinated, the offspring represent the $F_2$ generations. Here, both the parental traits are expressed in the offspring, in the ratio 3:1.