Genetics: Principles of Inheritance and Variation MCQ Test

41. What two phenomena are mentioned as leading to variation in DNA?

• Hybridization and self-pollination.
• Dominance and recessiveness.
• Recombination and mutation.
• Segregation and independent assortment.

42. A female can rarely be haemophilic because:

• The gene is on the autosomes.
• She would need to inherit the recessive gene from only one parent.
• Her mother has to be at least a carrier and her father should be haemophilic (which is often unviable in the later stage of life).
• Haemophilia primarily affects females.

43. In human genetics, pedigree study serves as a strong tool to:

• Conduct controlled crosses on human subjects.
• Trace the inheritance of specific traits, abnormalities, or diseases over generations.
• Artificially select desirable traits in offspring.
• Determine the exact number of chromosomes in an individual.

44. Which of the following is an autosomal recessive disorder?

• Haemophilia
• Colour blindness
• Sickle-cell anaemia
• Klinefelter's Syndrome