Match List-I with List-II
| List-I Genetic disorders | List-II Features |
|---|---|
| (A) Thalassemia | (I) Absence of one X chromosome. |
| (B) Down's Syndrome | (II) Sex-linked recessive |
| (C) Haemophilia | (III) Autosome-linked recessive |
| (D) Turner's Syndrome | (IV) Trisomy of chromosome number 21 |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
(A) Thalassemia — this matches (III) Autosome-linked recessive. Its genes lie on autosomes (chromosomes 16 and 11), not on the sex chromosomes. A child is affected only when both parents pass on the faulty allele, so it is recessive.
(B) Down’s Syndrome — this matches (IV) Trisomy of chromosome number 21. It is a chromosomal disorder. The person has an extra copy of chromosome 21, so the cells carry 47 chromosomes.
(C) Haemophilia — this matches (II) Sex-linked recessive. The gene lies on the X chromosome. A son with one faulty X shows the disease, while a heterozygous mother is a carrier, so it is seen far more often in males.
(D) Turner’s Syndrome — this matches (I) Absence of one X chromosome. Such a female has 44 autosomes and only one X (44 + XO), 45 chromosomes in all. She is sterile because her ovaries do not develop.
Note: A similar question was also asked in CUET (UG) 2026 on 07-06-2026 (Slot 2), and in CUET (UG) 2022 on 20-08-2022 (Slot 1).