MHT CET · BIOLOGY · STD 12 - 3. Inheritance and Variation

Select the group of CORRECT statements.
I. If phenotype of offsprings shows only the dominant trait then the parent plants are heterozygous.
II. A true breeding line shows stable trait inheritance and expression for several generations.
III. In mendelian experiment material, contrasting characters can be easily recognized.
IV. When a single gene controls two (or more) different traits, it is called polygene.
V. When interactions occurs between the alleles of different genes present on the same or different chromosome it is called intragenic interaction.

A III and V only
B II and III only
C III and IV only
D I and V only

Verified Solution

Answer & Solution

Correct Answer

(B) II and III only

Step-by-step Solution

Detailed explanation

I. Dominant phenotype can also come from homozygous dominant parents.
IV. When a single gene controls two (or more) different traits, it is called pleiotropy.
V. When interactions occurs between the alleles of different genes present on the same or different chromosome it is called intergenic interaction.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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