Match List-I with List-II.
| List-I | List-II |
|---|---|
| Chromosomal disorders | Features |
| (A) Polyploidy | (I) 45, XO |
| (B) Down syndrome | (II) More than two sets of chromosomes |
| (C) Turner syndrome | (III) 47, XXY |
| (D) Klinefelter syndrome | (IV) Trisomy of 21 |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A)-(II), (B)-(IV), (C)-(I), (D)-(III)
(A) Polyploidy — this matches (II) More than two sets of chromosomes. When cytokinesis fails after the chromosomes have divided, the cell gains a whole extra set of chromosomes. A cell with more than two sets is polyploid. It is often seen in plants.
(B) Down syndrome — this matches (IV) Trisomy of 21. The person has an extra copy of chromosome 21, that is three copies instead of two.
(C) Turner syndrome — this matches (I) 45, XO. One X chromosome is missing, so the female has 45 chromosomes with the sex chromosomes XO.
(D) Klinefelter syndrome — this matches (III) 47, XXY. The male has an extra X chromosome, giving 47 chromosomes with the sex chromosomes XXY.