Sample Questions — Inheritance of One Gene
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MCQ
What is the genotype of a pea plant showing the recessive dwarf trait?
✅ Correct Answer: C
tt denotes the genotype for the recessive dwarf trait.
MCQ
Which symbol represents the recessive allele in Mendel’s height gene?
✅ 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?
✅ 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?
✅ 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?
✅ Correct Answer: A
Homozygous means the two alleles for a gene are identical (e.g., TT or tt).
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