Identify the genetic disorder in which affected individual has a furrowed tongue, retarded mental development and broad palm?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Down’s Syndrome
Option (1) Klinefelter’s Syndrome — Incorrect. An extra X (47, XXY) gives a sterile male with some female features such as breast development.
Option (2) Down’s Syndrome — Correct. An extra copy of chromosome 21 (trisomy) gives a short stature, a small round head, a furrowed tongue, a partly open mouth, a broad palm with a characteristic palm crease, and retarded physical, psychomotor and mental development.
Option (3) Turner’s Syndrome — Incorrect. A missing X (45, XO) gives a sterile female with rudimentary ovaries.
Option (4) Haemophilia — Incorrect. It is a sex-linked blood-clotting disorder, not a chromosomal syndrome.
NCERT Extract:
Chromosomal Disorders – …
Figure 4.16 A representative figure showing an individual inflicted with Down’s syndrome and the corresponding chromosomes of the individual