This quiz works best with JavaScript enabled. Home > Plant > Principles Of Genetics – Quiz 21 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Principles Of Genetics Quiz 21 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. If man has type a blood, he can be: A) Ii. B) IAIB. C) IAi. D) IBi. Show Answer Correct Answer: C) IAi. 2. The random change in the ratio of alleles in a population over time is known as ..... A) Genetic engineering. B) Natural selection. C) Codominance. D) Genetic drift. Show Answer Correct Answer: D) Genetic drift. 3. Strands of DNA that are twisted together are called - A) Nitrogen bases. B) Genotypes. C) Chromosomes. D) Recessive. Show Answer Correct Answer: C) Chromosomes. 4. What special type of inheritance involves both alleles being dominant for a trait, and both being shown equally? A) Incomplete dominance. B) Codominance. C) Polygenic inheritance. D) None of above. Show Answer Correct Answer: B) Codominance. 5. Heterozygous alleles are also considered to be: A) Hybrid. B) Purebred. C) Phenotype. D) Genotype. Show Answer Correct Answer: A) Hybrid. 6. Two or more genes interact to produce a single trait. A) Polygenic inheritance. B) Incomplete dominance. C) Multiple alleles. D) Simple dominance. Show Answer Correct Answer: A) Polygenic inheritance. 7. Of 12 hamsters just born, 9 have brown fur and 3 have white fur. The trait for white fur is considered to be ..... A) Recessive. B) Weak. C) Strong. D) Dominant. Show Answer Correct Answer: A) Recessive. 8. A ..... allele is represented by lowercase letters and will only show up if paired with a similar allele. A) Dominant. B) Recessive. C) Traits. D) None of above. Show Answer Correct Answer: B) Recessive. 9. What did Mendel observe in the F2 offspring that showed him that the alleles for seed shape segregate independently of those for seed color? A) Whether the offspring had round vs wrinkled and yellow vs green seeds was completely separate. B) All the offspring had round seeds, only color changed. C) The results were half round yellow and half wrinkled green. D) All of the offspring had yellow seeds, only shape changed. Show Answer Correct Answer: A) Whether the offspring had round vs wrinkled and yellow vs green seeds was completely separate. 10. The number of possible genetically different gametes for an organism equals 2N, where N is the number of pairs of chromosomes. If an organism has four pairs of chromosomes, how many different gametes can it produce? A) 8. B) 4. C) 32. D) 16. Show Answer Correct Answer: D) 16. 11. Multiple Alleles A) Trait controlled by two or more genes. B) Gene that has more than two alleles. C) Entire set of genetic information that an organism carries in its DNA. D) None of above. Show Answer Correct Answer: B) Gene that has more than two alleles. 12. A ..... crosses one trait. A) Dihybrid cross. B) Trihybrid cross. C) Monohybrid cross. D) None of above. Show Answer Correct Answer: C) Monohybrid cross. 13. In 1866, Gregor Mendel published the results of experiments involving pea plants. In one experiment, Mendel crossed plants that produced smooth, yellow peas with plants that produced green, wrinkled peas. Every pea in the first generation crop from this cross was yellow and smooth. What conclusion did Mendel draw from this experiment? A) Some inherited traits are dominant while other traits are recessive. B) Some traits are inherited, but a pea's appearance is determined by its environment. C) Pea plants do not inherit traits from either parent. D) Pea plants inherit traits from only one parent. Show Answer Correct Answer: A) Some inherited traits are dominant while other traits are recessive. 14. Gametes are eggs and sperm (sex cells). Human have 46 chromosomes, but how many are found in their gametes? A) 11.5. B) 23. C) 46. D) 92. Show Answer Correct Answer: B) 23. 15. In Mendel's experiments, what is the approximate ratio of dominant to recessive expression when both parents are hybrids? A) . 4:1. B) 2:1. C) 3:1. D) 1:1. Show Answer Correct Answer: C) 3:1. 16. Mendel discovered principles of inheritance because he: A) Observed simultaneously all of the many characteristics in which the parents differed. B) Believed that the hereditary characteristics of two individuals became thoroughly blended in the offspring. C) Ignored all characteristics except a few markedly contrasting ones in which he studied. D) Studied only the offspring obtained from a single mating. Show Answer Correct Answer: C) Ignored all characteristics except a few markedly contrasting ones in which he studied. 17. The offspring of purebred pea plants with round seeds will always have ..... seeds. A) Round. B) Wrinkled. C) Yellow. D) Some round and some wrinkled. Show Answer Correct Answer: A) Round. 18. Which of the following is an example of multiple alleles? A) The gene that controls fur color in rabbits has four different alleles. B) Depends in the interaction of two genes like retrievers being black, brown or yellow. C) Human eye color being controlled by sixteen different genes. D) Red bull crossed with a white cow to make a pink calf. Show Answer Correct Answer: A) The gene that controls fur color in rabbits has four different alleles. 19. When 2 pea plants heterozygous for height (Tt) are crossed, what is the ratio of the resulting genotypes (TT:Tt:tt)? A) 1:2:1. B) 2:1:1. C) 0:3:1. D) 0:2:2. Show Answer Correct Answer: A) 1:2:1. 20. What principle states that during gamete formation genes for different traits separate without influencing each other's inheritance? A) Principle of dominance. B) A. principle of independent assortment. C) Principle of probabilities. D) Principle of segregation. Show Answer Correct Answer: B) A. principle of independent assortment. ← PreviousNext →Related QuizzesPrinciples Of Genetics Quiz 1Principles Of Genetics Quiz 2Principles Of Genetics Quiz 3Principles Of Genetics Quiz 4Principles Of Genetics Quiz 5Principles Of Genetics Quiz 6Principles Of Genetics Quiz 7Principles Of Genetics Quiz 8Principles Of Genetics Quiz 9Principles Of Genetics Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books