Q1. Which type of sex determination system is seen in birds?A. XY systemB. XO systemC. ZW systemD. Haplodiploidy
Q2. What is the function of a Barr body in female cells?A. Activates all X chromosomesB. Prevents expression of autosomal genesC. Inactivates one X chromosomeD. Determines the sex of the individual
Q3. What is the role of the Y-chromosome in human sex determination?A. It determines female characteristicsB. It triggers male developmentC. It carries genes for blood typeD. It is inherited only from the mother
Q4. Which of the following conditions results from monosomy of the X chromosome?A. Klinefelter’s syndromeB. Turner’s syndromeC. Down’s syndromeD. Edward’s syndrome
Q5. Which of the following is an incorrect statement about co-dominance?A. Both alleles are expressed in the heterozygous state.B. AB blood group is an example of co-dominance.C. One allele completely suppresses the other in co-dominance.D. Co-dominance differs from incomplete dominance.
Q6. Which of the following correctly describes pleiotropy?A. One gene affects multiple traits.B. Multiple genes affect a single trait.C. One gene determines only one phenotype.D. Traits are inherited through mitochondrial DNA.
Q7. Which of the following explains why some traits disappear in the F1 generation but reappear in the F2 generation?A. Incomplete dominanceB. Co-dominanceC. Law of DominanceD. Law of Segregation
Q8. Which of the following statements about genetic variation is correct?A. Mutation is the only source of genetic variation.B. Genetic variation can result from recombination.C. All mutations lead to harmful effects.D. Genetic drift does not contribute to variation.
Q9. What is the primary cause of Down’s syndrome?A. Mutation in the hemoglobin geneB. Trisomy of chromosome 21C. Deletion of chromosome 18D. Loss of the Y chromosome
Q10. Which of the following genetic disorders follows a Y-linked inheritance pattern?A. Color blindnessB. HemophiliaC. Hypertrichosis (hairy ears)D. Sickle-cell anemia