Match List-I with List-II:
| List-I | List-II |
|---|---|
| (A) Thalassemia | (I) 47, XXY |
| (B) Klinefelter’s syndrome | (II) Sex linked recessive disorder |
| (C) Turners’ syndrome | (III) 45, XO |
| (D) Colour blindness | (IV) Autosomal recessive disease |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (A)-(IV), (B)-(I), (C)-(III), (D)-(II)
(A) Thalassemia — this matches (IV) Autosomal recessive disease. The globin genes lie on autosomes (chromosomes 16 and 11). A child is affected only when both parents pass on the faulty allele.
(B) Klinefelter’s syndrome — this matches (I) 47, XXY. It is caused by an extra X chromosome in a male. The person is a sterile male with some feminine features, such as development of breasts.
(C) Turners’ syndrome — this matches (III) 45, XO. It is caused by the absence of one X chromosome. Such females are sterile, as their ovaries are rudimentary.
(D) Colour blindness — this matches (II) Sex linked recessive disorder. The gene lies on the X chromosome. Males have only one X, so a single faulty allele makes a son colour blind, while a daughter needs two.