CUET · BIOLOGY · PYQ PAPER 2025

Polygenic traits are controlled by:

A One gene
B Two genes
C Three or more genes
D One or two genes

Verified Solution

Answer & Solution

Correct Answer

(C) Three or more genes

Step-by-step Solution

Detailed explanation

Three or more genes

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

Match List I with List - II.

List - I	List - II
(A) Produces crystals of toxic insecticidal proteins	(I) Meloidegyne incognitia
(B) Nematode which infects the roots of tobacco plant	(II) Agrobacterium tumefaciens
(C) Vector used to transfer the nematode specific gene into the host plant was obtained from	(III) Bacillus thuringiensis
(D) Plasmids used to produce the insulin chains were obtained from	(IV) Propionibacterium sharmanii
	(V) Eshcherichia coli

Choose the correct answer from the options given below:

CUET 2023 Medium

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From CUET

Arrange the following steps in sequence of their occurance in the process of genetic modification of an organism.
(A) Cutting of desirable genes and vector DNA by molecular scissors.
(B) Introduction and maintenance of recombinant DNA in the host cell.
(C) Identification of DNA sequence with desirable gene.
(D) Linking of desirable genes with vector DNA.
Choose the correct answer from the options given below :

CUET 2023 Medium

Match List-I with List-II

List-I (Terms)	List-II (Applications)
(A) RNA interference	(I) ADA deficiency
(B) Genetically engineered insulin	(II) \(\alpha\)-1-antitrypsin
(C) Gene therapy	(III) Meloidegyne incognitia
(D) Biological product	(IV) Eli Lilly

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CUET 2025 Easy

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List-I (Geological periods)	List-II (Plants evolved)
(A) Devonian	(I) Gnetales
(B) Carboniferous	(II) Cycads
(C) Jurassic	(III) Seed ferns
(D) Cretaceous	(IV) Progymnopserms