Sample Questions — Inheritance of Two Genes
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MCQ
Q1. Why did Mendel observe a 9:3:3:1 phenotypic ratio in F₂ generation of his dihybrid cross?
✅ Correct Answer: C
Mendel’s dihybrid cross showed that the segregation of one trait did not affect the segregation of another, proving independent assortment.
MCQ
In dihybrid cross, the genotype RrYy produces how many types of gametes?
✅ Correct Answer: B
Gamete types are RY, Ry, rY, ry due to independent segregation of R and Y genes.
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MCQ
Q3. Which condition best supports the Law of Independent Assortment?
✅ Correct Answer: B
Genes on different chromosomes assort independently. Tightly linked genes violate this law.
MCQ
Q7. What would be the genotypes of gametes from a RrYy plant if independent assortment did not occur?
✅ Correct Answer: A
Without independent assortment (i.e., if genes are linked), only parental combinations would be produced.
MCQ
Q9. How does the chromosomal alignment at metaphase I explain the Law of Independent Assortment?
✅ Correct Answer: C
Random alignment of maternal and paternal chromosomes during metaphase I enables independent gene assortment.
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