Animal Genetics MCQs January 8, 2026March 26, 2024 by u930973931_answers 20 min Score: 0 Attempted: 0/20 Subscribe 1. . What is genetics? (A) The study of animal behavior (B) The study of animal anatomy (C) The study of genes and heredity (D) The study of animal physiology 2. . Which molecule carries genetic information in animals? (A) RNA (B) Protein (C) DNA (D) Lipid 3. . How many chromosomes do humans typically have? (A) 23 pairs (B) 46 pairs (C) 24 pairs (D) 22 pairs 4. . What term describes the different forms of a gene? (A) Trait (B) Allele (C) Genotype (D) Phenotype 5. . Which scientist is known as the father of modern genetics? (A) Charles Darwin (B) Gregor Mendel (C) Watson and Crick (D) Thomas Hunt Morgan 6. . In a genetic cross between two heterozygous individuals (Aa x Aa), what is the expected ratio of offspring with the dominant phenotype? (A) 1:1 (B) 1:2:1 (C) 3:1 (D) 1:3 7. . What is the term for the physical expression of an organism’s genetic makeup? (A) Genotype (B) Phenotype (C) Allele (D) Chromosome 8. . What is the term for an individual that has two identical alleles for a particular gene? (A) Heterozygous (B) Homozygous (C) Dominant (D) Recessive 9. . In a genetic cross between two heterozygous individuals (Aa x Aa), what is the expected ratio of offspring with the recessive phenotype? (A) 1:1 (B) 1:2:1 (C) 3:1 (D) 1:3 10. . What term describes the likelihood of an event occurring, such as inheriting a specific trait? (A) Probability (B) Homology (C) Dominance (D) Recessiveness 11. . Which of the following genetic disorders is caused by a recessive allele on the X chromosome? (A) Down syndrome (B) Hemophilia (C) Huntington's disease (D) Sickle cell anemia 12. . What is the term for the inheritance pattern in which both alleles contribute to the phenotype of the heterozygote? (A) Incomplete dominance (B) Codominance (C) Polygenic inheritance (D) Epistasis 13. . What term describes a trait that is controlled by multiple genes? (A) Dominant trait (B) Recessive trait (C) Polygenic trait (D) Monogenic trait 14. . In a dihybrid cross (AaBb x AaBb), what is the expected phenotypic ratio? (A) 9:3:3:1 (B) 1:2:1 (C) 3:1 (D) 1:1 15. . What is the term for the masking of the effect of one gene by another gene at a different locus? (A) Incomplete dominance (B) Codominance (C) Epistasis (D) Polygenic inheritance 16. . Which of the following genetic disorders is caused by a trisomy of chromosome 21? (A) Down syndrome (B) Hemophilia (C) Huntington's disease (D) Turner syndrome 17. . What is the term for a mutation that results in the loss of one or more nucleotides from a gene? (A) Insertion (B) Deletion (C) Substitution (D) Translocation 18. . Which of the following genetic disorders is caused by a mutation in the CFTR gene, leading to abnormal chloride ion transport? (A) Cystic fibrosis (B) Down syndrome (C) Huntington's disease (D) Hemophilia 19. . What is the term for the random change in allele frequencies in a population over time? (A) Mutation (B) Migration (C) Genetic drift (D) Natural selection 20. . Which of the following is NOT a mechanism of genetic variation in populations? (A) Mutation (B) Genetic drift (C) Gene flow (D) Phenotypic plasticity