Genetic Basis of Adaptation and Fitness — NEET Biology
📚 Practice ConceptHence, there must be a genetic basis for getting selected and to evolve. Another way of saying the same thing is that some organisms are better adapted to survive in an otherwise hostile environment. Adaptive ability is inherited. It has a genetic basis. Fitness is the end result of the ability to adapt and get selected by nature.
Sickle cell anaemia persists in certain populations despite being harmful. Which principle best explains this?
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Correct answer: A — Heterozygotes have selective advantage
A point mutation changes glutamic acid to valine in the β-globin gene. In malaria-prone areas, heterozygotes survive better, so the allele is maintained by selection.
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Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.