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Genetics and Plant Breeding

Mendelian Genetics Practice Questions

20 free Mendelian Genetics practice questions for the Botany, each with the correct answer and a detailed explanation. Open any question below, or take the full set as an interactive quiz.

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All Mendelian Genetics questions

20 questions
  1. Q1. Which of the following reasons best explains why Gregor Mendel chose Pisum sativum for his genetic experiments?
  2. Q2. According to Mendel's Law of Segregation, what happens to the two alleles for a trait during gamete formation?
  3. Q3. In a monohybrid cross between two heterozygous (Tt) tall pea plants, what is the expected genotypic ratio of the offspring?
  4. Q4. The Law of Independent Assortment is best demonstrated using which type of cross?
  5. Q5. What is the primary purpose of a 'Test Cross' in Mendelian genetics?
  6. Q6. If a true-breeding plant with round seeds (RR) is crossed with a true-breeding plant with wrinkled seeds (rr), the F1 generation will consist of:
  7. Q7. In Mendel's dihybrid cross (RrYy x RrYy), what is the probability of obtaining an offspring that is homozygous recessive for both traits (rryy)?
  8. Q8. Which term describes the physical appearance or observable characteristics of an organism?
  9. Q9. The term 'Allele' refers to:
  10. Q10. Which Mendelian principle was later found to be violated by the phenomenon of 'Linkage'?
  11. Q11. A cross between an F1 hybrid (Tt) and its homozygous recessive parent (tt) is specifically called a:
  12. Q12. When Mendel crossed tall and dwarf plants, the F2 generation showed both traits in a 3:1 ratio. This proved that:
  13. Q13. How many different types of gametes can be produced by a plant with the genotype AaBbCc?
  14. Q14. In snapdragons, a cross between red-flowered and white-flowered plants produces pink-flowered F1 plants. This is an example of:
  15. Q15. Which of the following represents a homozygous condition?
  16. Q16. Mendel's work was published in 1866 but remained largely unnoticed until it was rediscovered in 1900 by:
  17. Q17. In a dihybrid cross, the phenotype ratio 9:3:3:1 indicates that:
  18. Q18. The actual site of a gene on a chromosome is called its:
  19. Q19. In Mendelian inheritance, a 'Reciprocal Cross' is performed to determine:
  20. Q20. A dihybrid plant (AaBb) is self-pollinated. What proportion of the offspring will be dihybrid (AaBb) like the parent?