Inheritance of One Gene — NEET Biology Questions

Practice 11 questions on Inheritance of One Gene from Principles of inheritance and variation (NCERT Class 12, Chapter 4). Free samples below — get all 11 in the app.

11 Questions Principles of inheritance and variation Class 12

Sample Questions — Inheritance of One Gene

Try 5 questions below from Inheritance of One Gene. Get all 11 in the MedicNEET app.

MCQ
What is the genotype of a pea plant showing the recessive dwarf trait?
  • A. TT
  • B. Tt
  • C. tt
  • D. tT
✅ Correct Answer: C
tt denotes the genotype for the recessive dwarf trait.
MCQ
Which symbol represents the recessive allele in Mendel’s height gene?
  • A. T
  • B. t
  • C. H
  • D. h
✅ Correct Answer: B
t is the recessive allele; T is dominant tall.
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MCQ
What is the phenotypic ratio of a self‑pollinated Tt plant?
  • A. 1:3
  • B. 2:1
  • C. 3:1
  • D. 1:2:1
✅ Correct Answer: C
Selfing a heterozygote (Tt x Tt) yields 3 tall : 1 dwarf phenotype.
MCQ
In Mendel's monohybrid cross of tall (TT) and dwarf (tt) pea plants, what genotype do F₁ progeny possess?
  • A. TT
  • B. Tt
  • C. tt
  • D. None of these
✅ Correct Answer: B
All F1 progeny are Tt (heterozygous) because one tall allele from TT and one dwarf allele from tt.
MCQ
Which term describes two identical alleles for a gene in an organism?
  • A. Homozygous
  • B. Heterozygous
  • C. Hybrid
  • D. Hemizygous
✅ Correct Answer: A
Homozygous means the two alleles for a gene are identical (e.g., TT or tt).

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