This quiz works best with JavaScript enabled. Home > Plant > Principles Of Genetics – Quiz 28 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Principles Of Genetics Quiz 28 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. According to the principle of dominance, when dominant allele and recessive allele are present ..... A) The dominant will always win. B) The recessive will always win. C) No allele will win. D) Both will win. Show Answer Correct Answer: A) The dominant will always win. 2. When Mendel crossed a true-breeding plant with purple flowers and a true-breeding plant with white flowers, All offspring had purple flowers. This is because white flowers are ..... * A) Dominant. B) Heterozygous. C) Polygenic. D) Recessive. Show Answer Correct Answer: D) Recessive. 3. Piece of DNA that tells about a specific trait A) Chromosome. B) Gene. C) RNA. D) Allele. Show Answer Correct Answer: B) Gene. 4. These types of alleles are only expressed if the organism has two copies A) Dominant. B) Recessive. C) Homozygous. D) Heterozygous. Show Answer Correct Answer: B) Recessive. 5. Some flowers are controlled by codominance. Red flowers (RR), blue flowers (BB) and Speckled flowers (RB).Cross a red flower with a speckled flower. What is the phenotypic ratio? A) 2 red, 2 speckled. B) 2 red, 2 blue. C) 2 blue, 2 speckled. D) None of above. Show Answer Correct Answer: A) 2 red, 2 speckled. 6. B = brown eyesb = blue eyesOne brother has genotype BB and the other brother has genotype Bb.Which statement is true about these two brothers? A) They have same phenotype and genotype. B) They have different phenotypes and genotypes. C) They have same phenotype, but different genotypes. D) They have different phenotypes, but the same genotype. Show Answer Correct Answer: C) They have same phenotype, but different genotypes. 7. In Mendel's model of segregation, what was the ratio of tall plants to short plants in the F2 generation? A) 4:1. B) 3:1. C) 2:1. D) 1:1. Show Answer Correct Answer: B) 3:1. 8. Tool used to predict the probability of certain traits in offspring that shows the ways the alleles can combine A) Recessive. B) Punnett Square. C) Genotype. D) DNA. Show Answer Correct Answer: B) Punnett Square. 9. A characteristic passed from parents to their offspring is called a ..... trait. A) Acquired. B) Inherited. C) Dominant. D) Recessive. Show Answer Correct Answer: B) Inherited. 10. Why did Thomas Hunt Morgan use fruit flies in his studies? A) Fruit flies produce a large number of offspring. B) Fruit flies take a long time to produce offspring. C) Fruit flies share certain characteristics with pea plants. D) Fruit flies have a long lifespan. Show Answer Correct Answer: A) Fruit flies produce a large number of offspring. 11. Which of the following is determined by multiple alleles? A) PKU. B) Huntington's disease. C) Rh blood group. D) ABO blood group. Show Answer Correct Answer: D) ABO blood group. 12. A ..... is a segment of DNA that has the code for a specific trait. A) DNA. B) Gene. C) Trait. D) Chromosome. Show Answer Correct Answer: B) Gene. 13. Which of the following is a genetic cross between two purebred pea plants? A) Tt x Tt. B) Tt x tt. C) TT x tt. D) None of the answers are correct. Show Answer Correct Answer: C) TT x tt. 14. Which BEST describes the phrase incomplete dominance? A) Genes on the X and Y chromosomes. B) One gene winning over another gene. C) Genes whose phenotypes are a mix. D) Two copies of each gene. Show Answer Correct Answer: C) Genes whose phenotypes are a mix. 15. The best genome representation for a homozygous dominant A) AA. B) Aa. C) Aa. D) None of above. Show Answer Correct Answer: A) AA. 16. Known as the "Father of Genetics". He discovered the principles of heredity. A) Einstein. B) Chase. C) Mendel. D) Franklin. Show Answer Correct Answer: C) Mendel. 17. Punnett Squares reflect the ..... of offspring genotypes resulting from a cross between parents. A) Probability. B) Certainty. C) Genetics. D) DNA. Show Answer Correct Answer: A) Probability. 18. What is the diploid number in human cells? A) 2. B) 23. C) 46. D) 92. Show Answer Correct Answer: C) 46. 19. If one parent contributes a type A allele, and the other parent contributes a type B allele, their child will have what type of blood? A) A. B) AB. C) O. D) B. Show Answer Correct Answer: B) AB. 20. When 2 heterozygous parents (Qq) are crossed, what are the alleles of the offspring? A) 25% QQ, 50% Qq, 25% qq. B) 100% QQ. C) 50% Qq. D) None of above. Show Answer Correct Answer: A) 25% QQ, 50% Qq, 25% qq. ← 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