This quiz works best with JavaScript enabled. Home > Agriculture > Plant > Genetics > Principles Of Genetics – Quiz 21 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Principles Of Genetics Quiz 21 (30 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What makes a dominant allele different from a recessive allele? A) The dominant allele always mixes with the recessive allele. B) The dominant allele determines the trait. C) The dominant allele determines the trait. D) The recessive allele determines the trait. Show Answer Correct Answer: B) The dominant allele determines the trait. 2. Pink snapdragons are an example of what? A) Multiple alleles. B) Codominance. C) Complete dominance. D) Incomplete dominance. Show Answer Correct Answer: D) Incomplete dominance. 3. A genetic trait that appears in every generation of offspring is called . A) Dominant. B) Superior. C) Recessive. D) Phenotypic. Show Answer Correct Answer: A) Dominant. 4. A mule is the result of a cross between a donkey and a horse. A mule is a A) Tetrad. B) Hybrid. C) Phenotype. D) Genotype. Show Answer Correct Answer: B) Hybrid. 5. On which fruit fly chromosome is the gene for purple eye color located? A) Chromosome 2. B) It can be on a random chromosome. C) The eye chromosome. D) The color chromosome. Show Answer Correct Answer: A) Chromosome 2. 6. Earlobes can be either attached or detached. The allele for attached earlobes is recessive (e), and the allele for detached earlobes is dominant (E). What must be true if a boy is born with attached earlobes? A) He has one of each allele. B) He has a heterozygous genotype. C) He has no recessive alleles. D) He has a homozygous genotype. Show Answer Correct Answer: D) He has a homozygous genotype. 7. Variation in human skin color is a result of A) Incomplete dominance. B) Polygenic traits. C) Codominance. D) Multiple alleles. Show Answer Correct Answer: B) Polygenic traits. 8. Epistasis is the interaction between ..... genes. A) 8. B) 2. C) 4. D) 16. Show Answer Correct Answer: B) 2. 9. Down Syndrome is a disorder in which a person has an extra A) 20th chromosome. B) 21st chromosome. C) 22nd chromosome. D) 23rd chromosome. Show Answer Correct Answer: B) 21st chromosome. 10. T = Tall; t = shortIf you cross a homozygous tall plant with a homozygous short plant, what will the offsprings' phenotype be? A) Tall and short. B) All Tall. C) All Short. D) None of above. Show Answer Correct Answer: B) All Tall. 11. Which one of these did Mendels Hypothesis not mention A) For each inherited trait, an individual has two copies of the gene - one from each parent. B) Organisms donate only one copy of each gene in their gametes. C) There are alternative versions of genes called alleles. D) When two different alleles are present together, one of them might be completely expressed, while the other may have no effect on the physical appearance. Show Answer Correct Answer: B) Organisms donate only one copy of each gene in their gametes. 12. Name the pattern:Two traits produce a blended phenotype A) Incomplete dominance. B) Multiple alleles. C) Polygenic inheritance. D) Codominance. Show Answer Correct Answer: A) Incomplete dominance. 13. Cross in first filial generation produces generation called A) P2 generation. B) F2 generation. C) G1 generation. D) F1 generation. Show Answer Correct Answer: B) F2 generation. 14. Which organisms did Mendel use to form his principles on the inheritance of traits? A) Four-o'clock flowers. B) Roan cattle. C) Fruit flies. D) Pea plants. Show Answer Correct Answer: D) Pea plants. 15. Magda is a tall, 11 year old drummer. She has a scar on her right cheek. She is good at swimming. Which of her traits did Magda most likely inherit? A) Height. B) Ability to play drums. C) Ability to swim. D) The scar. Show Answer Correct Answer: A) Height. 16. What is the chance of having a boy instead of a girl? A) 25%. B) 100%. C) 50%. D) 75%. Show Answer Correct Answer: C) 50%. 17. How many recessive alleles for a trait must an organism inherit in order to show that trait? A) 2. B) 46. C) 23. D) 1. Show Answer Correct Answer: A) 2. 18. What is the pattern when you cross red-flowering camellia and a white-flowering camellia to produce camellias with flowers that are both red and white? A) Incomplete dominance. B) Multiple alleles. C) Polygenic inheritance. D) Codominance. Show Answer Correct Answer: D) Codominance. 19. What do we use pedigrees for? A) To look at families. B) To make determinations about the offspring. C) To track traits in families. D) None of above. Show Answer Correct Answer: C) To track traits in families. 20. How many PAIRS of chromosomes are there in a karyotype A) 23. B) 24. C) 46. D) 48. Show Answer Correct Answer: A) 23. 21. One of the parents of a child has phenylketonuria (PKU), which is caused by recessive alleles. The other parent does not have the PKU alleles. What is the chance that the couple will have a child with phenylketonuria? A) 0%. B) 75%. C) 50%. D) 100%. Show Answer Correct Answer: A) 0%. 22. How many alleles do we inherit? A) Both from father. B) We dont inherit alleles. C) 1 from each parent. D) Both from mother. Show Answer Correct Answer: C) 1 from each parent. 23. An allele that is fully expressed when carried by only one pair of homologous chromosomes ..... A) Recessive. B) Heredity. C) Dominant. D) Allele. Show Answer Correct Answer: C) Dominant. 24. Two different forms of a gene A) Alleles. B) Genotype. C) Genes / DNA. D) Phenotype. Show Answer Correct Answer: A) Alleles. 25. Which of the following factors could lead to variations in the offspring of asexually reproducing organisms? A) Mutations. B) Fertilization. C) Crossing over. D) Independent assortment. Show Answer Correct Answer: A) Mutations. 26. Gamete(sex cells) are produced by the process of A) Mitosis. B) Replication. C) Crossing-over. D) Meiosis. Show Answer Correct Answer: D) Meiosis. 27. Genetics is the study of A) Anatomy. B) Heredity. C) Cardiology. D) All of the above. Show Answer Correct Answer: B) Heredity. 28. If an organisms has 1 dominant and 1 recessive allele (Tt) for a trait it is called A) Homozygous. B) Twins. C) Heterozygous. D) Same. Show Answer Correct Answer: C) Heterozygous. 29. If we cross TT with tt, what is the probability that the offspring will have Tt? A) 100%. B) 50%. C) 0%. D) 75%. Show Answer Correct Answer: A) 100%. 30. What do you get when a black sheep mates with a white sheep. If the wool color is an example of incomplete dominance, the wool color will be? A) White. B) Grey. C) Black and white. D) Black. Show Answer Correct Answer: B) Grey. ← 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