NEET · Biology · STD 12 - 4. principal of inheritance and variation

The phenomenon of pleiotropism refers to

A More than two genes affecting a single character
B Presence of several alleles of a single gene controlling a single crossover
C Presence of two alleles, each of the two genes controlling a single trait
D A single gene affecting multiple phenotypic expression

Verified Solution

Answer & Solution

Correct Answer

(D) A single gene affecting multiple phenotypic expression

Step-by-step Solution

Detailed explanation

When a single gene affects multiple phenotypic expression, the gene is called pleiotropic gene and the phenomenon is called pleiotropism.

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.

Same subject

In which animal do haploid cells divide mitotically to produce gametes ?

NEET 2026 Medium

Match the following columns and select the correct option

Column\(-I\)	Column\(-II\)
\((a)\) Pituitary gland	\((i)\) Grave's disease
\((b)\) Thyroid gland	\((ii)\) Diabetes mellitus
\((c)\) Adrenal gland	\((iii)\) Diabetes insipidus
\(Z(d)\) Pancreas	\((iv)\) Addision's disease

\((a)\quad(b)\quad(c)\quad(d)\)

NEET 2020 Easy

Explore more questions on app

From NEET

Explore more questions on app