KCET · BIOLOGY · STD 12 - 4. Principles of Inheritance and Variation

In an organism, mutation in a single gene exhibits multiple phenotypic expressions. Identify the underlying genetic mechanism in the above instance.

A Multiple allelism
B Pleiotropy
C Incomplete dominance
D Polygenic inheritance

Verified Solution

Answer & Solution

Correct Answer

(B) Pleiotropy

Step-by-step Solution

Detailed explanation

(B) Pleiotropy,
When a gene controls multiple phenotype that are mostly unrelated, it is said to exhibit pleiotropy. For instance in a pea plants with coloured seed coats always have coloured flowers and pigmentation on the leaf, this means that the gene controlling seed colour is also controlling specific flower and leaf pigmentation.

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

Explore more questions on app

From KCET

Explore more questions on app