CUET · BIOLOGY · PYQ PAPER 2023

Karyotype of an individual is 47, XXY. The individual is suffering from :

A Down's syndrome
B Turner's syndrome
C Klinefelter's syndrome
D Thalassemia

Verified Solution

Answer & Solution

Correct Answer

(C) Klinefelter's syndrome

Step-by-step Solution

Detailed explanation

Klinefelter's syndrome

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 (Name of microorganism)	List - II (Chemical)
(A) Aspergillus niger	(I) Citric acid
(B) Acetobacter aceti	(II) Acetic acid
(C) Clostridium butylicum	(III) Butyric acid
(D) Lactobacillus	(IV) Lactic acid

CUET 2023 Hard

Match List-I with List-II

List-I Scientists	List-II Discoveries
(A) Walter Sutton and Boveri	(I) Linkage and recombination of genes on a chromosome
(B) Gregor Mendel	(II) Chromosomal theory of inheritance
(C) Thomas Hunt Morgan	(III) Law of inheritance
(D) Alfred Sturtevant	(IV) Genetic map

Choose the correct answer from the options given below:

CUET 2025 Medium

If 4 individuals in a laboratory population of 40 fruitflies died during a specific time interval of one week. What will be the death rate of the population during that period?

CUET 2025 Medium

Match List-l with List-ll

List-l (Enzymes)	List-II (Functions)
(A). DNA polymerase	(I). Transcribes precursor of mRNA (hnRNA)
(B). DNA ligase	(II). Transcribes rRNAs
(C). RNA polymerase	(III). Joins the DNA fragments
(D). RNA polymerase II	(IV). Catalyzes the polymerization of deoxynucleotides

the correct answer from the options given below:

CUET 2025 Medium

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From CUET

Match List - I with List - II. Given \(P(A)=\frac{1}{3}\) and \(P(B)=\frac{1}{5}\) where \(A\) and \(B\) are independent.

LIST I	LIST II
A. \(P(A \cap B)\)	I. \(\frac{7}{15}\)
B. \(P \left( A ^{\prime} \cap B ^{\prime}\right)\)	II. \(\frac{2}{5}\)
C. \(P\) (at least one of the two events takes place)	III. \(\frac{1}{15}\)
D. \(P\) (only one event takes place)	IV. \(\frac{8}{15}\)

Choose the correct answer from the options given below:

CUET 2023 Medium

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