Question

A student makes a monohybrid cross between TT and tt plants, where T is dominant and t is recessive. Identify the correct statements on the basis of the information given.

Statement 1: Recessive traits are expressed in both ${\text{F}}_1$ and ${\text{F}}_2$ generation.

Statement 2: Recessive traits are expressed only in the absence of corresponding dominant trait in the offspring.

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

Answer 1

The correct option is B Only statement 2 is correct.

As per the information given, it can be inferred that the recessive traits will be expressed only in the ${\text{F}}_2$ generation. Recessive traits fail to express themselves in the presence of the dominant traits. They are visible only if both the copies of the recessive trait exists together (tt). E.g., In ${\text{F}}_1$ generation the trait combination obtained is only Tt i.e. tall. But in the ${\text{F}}_2$ (selfing of the ${\text{F}}_1$ ) generation both dominant and recessive traits are obtained in the ratio 3:1 respectively.