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NEET 2026: Important Biology Questions — Genetics & Evolution

NEET Biology • 10 questions • Free on ExamBattle

Practice Questions

1. Q1

   In a dihybrid cross between RRYY × rryy, the F2 phenotypic ratio is:

   • A. 1:2:1
   • B. 9:3:3:1
   • C. 3:1
   • D. 1:1:1:1

2. Q2

   Sickle cell anaemia is caused by a mutation that changes which amino acid in haemoglobin?

   • A. Lysine to valine at position 6
   • B. Glutamic acid to valine at position 6
   • C. Alanine to glycine
   • D. Serine to threonine

3. Q3

   Hardy-Weinberg equilibrium is maintained when:

   • A. Natural selection occurs
   • B. Large random-mating population, no mutation/selection/migration
   • C. Genetic drift is high
   • D. Founder effect occurs

4. Q4

   The theory of evolution by natural selection was proposed by:

   • A. Lamarck
   • B. Charles Darwin
   • C. Mendel
   • D. Hugo de Vries

5. Q5

   Down syndrome is caused by trisomy of chromosome number:

   • A. 13
   • B. 21
   • C. 18
   • D. X

6. Q6

   Which of the following is evidence for evolution?

   • A. Vestigial organs only
   • B. Fossil record, homologous organs, comparative embryology, molecular biology
   • C. Natural selection only
   • D. Genetic drift only

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