This quiz works best with JavaScript enabled. Home > Agriculture > Plant > Genetics > Principles Of Genetics – Quiz 22 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Principles Of Genetics Quiz 22 (30 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. D = dimples d = no dimples What is the genotype for a homozygous recessive offspring? A) DD. B) Dd. C) Dd. D) None of above. Show Answer Correct Answer: B) Dd. 2. In dragons, large scales (S) are dominant and small scales (s) are recessive. A dragon that is heterozygous for the trait is crossed with a dragon that has small scales. What should be the ratio of large-scaled dragons to small-scaled dragons among the offspring? A) 1:2. B) 1:1. C) 3:1. D) 2:1. Show Answer Correct Answer: B) 1:1. 3. The different forms of a gene are known as ..... A) Codons. B) Proteins. C) Alleles. D) Nucleotides. Show Answer Correct Answer: C) Alleles. 4. What do the letters inside the grid of a Punnett square represent? A) Chromosomes of parents. B) Testcrosses of offspring. C) Genotypes of offspring. D) Phenotypes of parents. Show Answer Correct Answer: C) Genotypes of offspring. 5. Which of the following represents a heterozygous genotype? (3B1) A) Ab. B) AA. C) Aa. D) Aa. Show Answer Correct Answer: C) Aa. 6. 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) 3/4. B) 2/4. C) 4/4. D) 1/4. Show Answer Correct Answer: B) 2/4. 7. 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. 8. Mendel used pea plants to study A) Gamete formation. B) Cross-pollination. C) Flowering. D) The inheritance of traits. Show Answer Correct Answer: B) Cross-pollination. 9. Serves to either support or counter a scientific theory or hypothesis A) Theory. B) Evidence. C) Law. D) Hypothesis. Show Answer Correct Answer: B) Evidence. 10. Co dominance is exhibited by A) HAEMOPHILIA. B) SICKLE CELL ANAEMIA. C) A, B Blood group. D) ABO blood group. Show Answer Correct Answer: C) A, B Blood group. 11. The random change in the ratio of alleles in a population over time. A) Incomplete dominance. B) Codominance. C) Heredity. D) Genetic drift. Show Answer Correct Answer: D) Genetic drift. 12. 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. 13. If two genes are on the same chromosome and rarely assort independently, A) Crossing-over always occurs between the genes. B) The genes are probably located close to each other. C) Crossing-over never occurs between the genes. D) The genes are probably located far apart from each other. Show Answer Correct Answer: B) The genes are probably located close to each other. 14. Which genotype indicates hybrid? A) GG. B) GG; gg. C) Gg. D) Gg. Show Answer Correct Answer: C) Gg. 15. Multiple allelism is shown by A) HAEMOPHILIA. B) SICKLE CELL ANAEMIA. C) ABO Blood. D) AB blood. Show Answer Correct Answer: C) ABO Blood. 16. What symbol is used for a recessive trait? A) Underlined letter. B) Capital letter. C) Italicized letter. D) Lower case letter. Show Answer Correct Answer: D) 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) Law of Probability. B) Law of Segregation. C) Principle of Independent Assortment. D) Principle of Dominance. 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) 75%. B) 0%. C) 25%. D) 50%. Show Answer Correct Answer: D) 50%. 21. Name the pattern:two or more genes interact to produce a single trait A) Incomplete dominance. B) Multiple alleles. C) Polygenic inheritance. D) Codominance. Show Answer Correct Answer: C) Polygenic inheritance. 22. Human body cells that have 46 chromosomes are called A) Gametes. B) Diploid cells. C) Haploid cells. D) Sex cells. Show Answer Correct Answer: B) Diploid cells. 23. Polymerase Chain Reaction A) Term used to refer to an organism that contains genes from other organism. B) DNA produced by combining DNA from different sources. C) The technique used by biologists to make many copies of a particular gene. D) None of above. Show Answer Correct Answer: C) The technique used by biologists to make many copies of a particular gene. 24. A ..... ..... is a chart that is used to calculate the probability of an offspring's combination of alleles. A) Punnett Square. B) Mendel Square. C) James Square. D) None of above. Show Answer Correct Answer: A) Punnett Square. 25. The passing of characters from parents to offspring is called? A) Genetics. B) Monohybrid cross. C) Heredity. D) True breeding. Show Answer Correct Answer: C) Heredity. 26. In dogs, wire hair (H) is dominant to smooth hair (h). In a cross of a homozygous wire-haired dog with a smooth-haired dog, what will be the phenotypic ratio of the F1 Generation? A) 25% wire-haired. B) 0% wire-haired. C) 50% wire-haired. D) 100% wire-haired. Show Answer Correct Answer: D) 100% wire-haired. 27. Which is an example of selective breeding? A) A scientist changed the genetic make-up of a human's white blood cells to ensure they were healthy. B) A scientist maintains a group of retriever dogs by only mating retriever dogs together. C) A scientist produced a lamb from a frozen cell of another adult sheep. D) A scientist produces a bacteria that can make human insulin. Show Answer Correct Answer: B) A scientist maintains a group of retriever dogs by only mating retriever dogs together. 28. If a rabbit that is heterozygous for black & hairy (BbHh) is crossed with a rabbit that is homozygous for black but hairless hairy (BBhh), how many different phenotypes are their offspring expected to show? A) 3. B) 8. C) 2. D) 16. Show Answer Correct Answer: A) 3. 29. What is a Tay Sach? A) A Virus. B) A non inherited disease. C) A recessive disorder. D) A dominant disorder. Show Answer Correct Answer: C) A recessive disorder. 30. When an organism has two of the same alleles, it is called A) Dominant. B) Heterozygous. C) Homozygous. D) Recessive. Show Answer Correct Answer: C) Homozygous. ← PreviousNext →Related QuizzesPlant QuizzesAgriculture 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 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books