This quiz works best with JavaScript enabled. Home > Plant > Genetics > Principles Of Genetics – Quiz 34 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Principles Of Genetics Quiz 34 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The different forms of a gene are known as ..... A) Codons. B) Proteins. C) Alleles. D) Nucleotides. Show Answer Correct Answer: C) Alleles. 2. What do the letters inside the grid of a Punnett square represent? A) Phenotypes of parents. B) Genotypes of offspring. C) Testcrosses of offspring. D) Chromosomes of parents. Show Answer Correct Answer: B) Genotypes of offspring. 3. Which of the following represents a heterozygous genotype? (3B1) A) Aa. B) Ab. C) AA. D) Aa. Show Answer Correct Answer: A) Aa. 4. Many people have big toes that are shorter than their second toes. The short big toe allele (S) is dominant to the long big toe allele (s).A Punnett square shows a cross between an Ss parent and an ss parent.What is the probability that their child will have short big toes? A) 1/4. B) 2/4. C) 3/4. D) 4/4. Show Answer Correct Answer: B) 2/4. 5. Which of the following would y ou be least likely to see in a pedigree? A) All of the symbols are half-shaded. B) About half of the symbols are circles. C) All of the symbols are unshaded. D) All of the symbols are shaded. Show Answer Correct Answer: A) All of the symbols are half-shaded. 6. Define Gene A) Condensed DNA that is visible during cell division. B) Different versions of the same gene. C) A section of DNA that codes for specific proteins/traits. D) Molecule which contains the genetic information for an organism. Show Answer Correct Answer: C) A section of DNA that codes for specific proteins/traits. 7. Mendel used pea plants to study A) Flowering. B) Gamete formation. C) The inheritance of traits. D) Cross-pollination. Show Answer Correct Answer: D) Cross-pollination. 8. Serves to either support or counter a scientific theory or hypothesis A) Law. B) Theory. C) Hypothesis. D) Evidence. Show Answer Correct Answer: D) Evidence. 9. Co dominance is exhibited by A) A, B Blood group. B) ABO blood group. C) SICKLE CELL ANAEMIA. D) HAEMOPHILIA. Show Answer Correct Answer: A) A, B Blood group. 10. The random change in the ratio of alleles in a population over time. A) Heredity. B) Codominance. C) Genetic drift. D) Incomplete dominance. Show Answer Correct Answer: C) Genetic drift. 11. What is the main reason that colorblindness, a sex-linked disorder, is most often observed in males? A) The Y chromosome cannot have genes that cause genetic disorders. B) The Y chromosome cannot mask alleles on the X chromosome. C) The X chromosome has genes only for sex determination. D) The X chromosome only has genes for genetic disorders. Show Answer Correct Answer: B) The Y chromosome cannot mask alleles on the X chromosome. 12. Define Genome A) Molecule which contains the genetic information for an organism. B) Different versions of the same gene. C) Condensed DNA that is visible during cell division. D) All the chromosomes/DNA that code for an individual's traits. Show Answer Correct Answer: D) All the chromosomes/DNA that code for an individual's traits. 13. If two genes are on the same chromosome and rarely assort independently, A) Crossing-over never occurs between the genes. B) The genes are probably located close to each other. C) The genes are probably located far apart from each other. D) Crossing-over always occurs between the genes. Show Answer Correct Answer: B) The genes are probably located close to each other. 14. Which genotype indicates hybrid? A) GG. B) Gg. C) Gg. D) GG; gg. Show Answer Correct Answer: B) Gg. 15. Multiple allelism is shown by A) ABO Blood. B) AB blood. C) SICKLE CELL ANAEMIA. D) HAEMOPHILIA. Show Answer Correct Answer: A) ABO Blood. 16. What symbol is used for a recessive trait? A) Capital letter. B) Lower case letter. C) Underlined letter. D) Italicized letter. Show Answer Correct Answer: B) Lower case letter. 17. What determines the color of western white butterflies? A) Temperature and genes. B) Genes alone. C) The environment alone. D) Exposure to sunlight and genes. Show Answer Correct Answer: A) Temperature and genes. 18. The inheritance of one trait has no influence on the inheritance of another trait is ..... A) Principle of Dominance. B) Law of Segregation. C) Principle of Independent Assortment. D) Law of Probability. Show Answer Correct Answer: C) Principle of Independent Assortment. 19. The principle of dominance states that A) All alleles are dominant. B) All alleles are recessive. C) Some alleles are dominant and some are recessive. D) Alleles are neither dominant or recessive. Show Answer Correct Answer: C) Some alleles are dominant and some are recessive. 20. If both parents are carriers of Tay-Sachs, what percentage of their children will also be carriers but not have the disease? (3B2) A) 0%. B) 25%. C) 50%. D) 75%. Show Answer Correct Answer: C) 50%. ← PreviousNext →Related QuizzesPlant 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 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books