🩺 NEET🧬 Biology

The most striking example of point mutation is found in a disease called;

Q1 FREE PREVIEW
The most striking example of point mutation is found in a disease called;
aDown's syndrome.
bSickle cell anaemia.
cThalassaemia.
dKlinefelter's syndrome.
✓ Correct answer: b) Sickle cell anaemia.
ExplanationA) Down's syndrome Not due to point mutation.It is caused by trisomy of chromosome 21 (a chromosomal abnormality).B) Sickle cell anaemia Correct — It is the most striking example of point mutation.A single base substitution (A → T) in the gene coding for the β-globin chain of haemoglobin.This changes glutamic acid to valine at the 6th position.C) Thalassaemia Caused by mutations or deletions in the genes controlling haemoglobin production, but not typically a simple point mutation.

Practice more NEET Biology PYQs

See every question on Principles of Inheritance and Variation, or browse the full NEET question bank.

See all questions on Principles of Inheritance and Variation →