This quiz works best with JavaScript enabled. Home > Agriculture > Plant > Genetics > Principles Of Genetics – Quiz 24 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Principles Of Genetics Quiz 24 (30 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The Australian Shepherds of America Club discourages from mating two merles. Which of the following best explains why merle to merle matings are undesirable? A) The cross has the probability of producing litters with 50% solid coat color pups. B) The cross produces all homozygous recessive pups. C) The cross has the probability of producing litters with 25% merle coat pups. D) The cross has a 25% chance of producing homozygous dominant pups. Show Answer Correct Answer: D) The cross has a 25% chance of producing homozygous dominant pups. 2. A wide range of phenotypic variations occur in the trait for human height. Which of the following accounts for these variations? A) Polygenic Inheritance. B) Codominance. C) Incomplete dominance. D) Multiple Alleles. Show Answer Correct Answer: A) Polygenic Inheritance. 3. Principle/Law of Independent is defined as ..... A) Some alleles are dominant over others. B) Allele pairs separate during gamete formation and randomly unite at fertilization. C) During gamete formation genes for different traits separate without influencing each other's inheritance. D) None of above. Show Answer Correct Answer: C) During gamete formation genes for different traits separate without influencing each other's inheritance. 4. Restriction Enzyme A) Process in which epigenetic chemical marks can be passed from one generation to the next in a sex-specific way. B) Enzyme that cuts DNA at a sequence of nucleotides. C) Error in meiosis in which the homologous chromosomes fail to separate properly. D) None of above. Show Answer Correct Answer: B) Enzyme that cuts DNA at a sequence of nucleotides. 5. Dog breeders around the world want to breed certain traits within dogs. One dog, for instance, can have both the floppy ear genetic trait, and a straight ear genetic trait. Mrs. Lloyd is a dog breeder who knows that her dog has the floppy ears gene (tt), but wants all of her dogs future offspring to have straight ears. What type of genotype would the other dog have to have inherited for Mrs. Lloyd's dog to reproduce puppy's with the straight ear gene? A) Mrs. Lloyd would have to breed her dog with a dog that has homozygous dominant gene trait. This means that if you cross a homozygous dominant allele pair and a homozygous recessive allele pair, the future offspring will have a 100 percent chance to have the straight ear gene. B) Mrs. Lloyd would have to breed her dog with a dog that has heterozygous dominant gene trait. This means that if you cross a heterozygous dominant allele pair with a homozygous recessive allele pair, the future offspring will have a 100 percent chance to have the straight ear gene. C) Mrs. Lloyd would have to breed her dog with a dog that has homozygous recessive gene trait. This means that if you cross a homozygous recessive allele pair and a homozygous recessive allele pair, the future offspring will have a 100 percent chance to have the straight ear gene. D) The dog is unable to have straight eared puppies, but the puppies future offspring may be able to breed straight eared puppies. Show Answer Correct Answer: A) Mrs. Lloyd would have to breed her dog with a dog that has homozygous dominant gene trait. This means that if you cross a homozygous dominant allele pair and a homozygous recessive allele pair, the future offspring will have a 100 percent chance to have the straight ear gene. 6. To perform his experiments, how did Mendel prevent pea flowers from self-pollinating and control their cross-pollination? A) He separated the male plants from the female plants. B) He did not try to prevent the plants from self-pollinating. C) He removed the male parts from the flowers and manually placed pollen on the plants. D) He removed the female parts from the flowers and manually placed pollen on the plants. Show Answer Correct Answer: C) He removed the male parts from the flowers and manually placed pollen on the plants. 7. Which of Mendel's laws states that alleles are separated during meiosis? A) Law of Dominance. B) Law of Meiosis. C) Law of Independent Assortment. D) Law of Segregation. Show Answer Correct Answer: D) Law of Segregation. 8. Application of mathematics and computer science to store, retrieve, and analyze biological data A) Pedigree. B) Gel Electrophoresis. C) Bioinformatics. D) Genomics. Show Answer Correct Answer: C) Bioinformatics. 9. Which law states that organisms inherit two copies of each gene and donate only one copy to each of their offspring? A) Law of inheritance. B) Law of independent assortment. C) Law of segregation. D) Law of genetic linkage. Show Answer Correct Answer: C) Law of segregation. 10. The best genome representation for homozygous recessive A) AA. B) Aa. C) Aa. D) None of above. Show Answer Correct Answer: B) Aa. 11. When Gregor Mendel crossed a tall plant with a short plant, the new baby plants inherited A) Two alleles from each parent. B) One allele from each parent. C) Two alleles from one parent. D) Four alleles from each parent. Show Answer Correct Answer: B) One allele from each parent. 12. Natural selection has the potential to accomplish which of the following? A) Allow a school of fish in the sea to become land-dwelling creatures. B) Change a population of foxes into mountain lions. C) Change a colony of bacteria into multicellular organisms. D) Allow finches to develop differently shaped beaks. Show Answer Correct Answer: D) Allow finches to develop differently shaped beaks. 13. In some carnations, flower color exhibits codominance. When crosses, Red (R) and white (W) flowers make speckled flowers (RW) that show both colors.Complete a cross between A speckled flower and a red flower. Find the phenotype ratio. A) 0 red:2 speckled:2 white. B) 0 red:4 speckled:0 white. C) 2 red:2 speckled:0 white. D) 4 red:0 speckled:0 white. Show Answer Correct Answer: C) 2 red:2 speckled:0 white. 14. In tobacco, if the diploid number of chromosomes is 48, how many chromosomes will be found in a pollen grain? A) 12. B) 48. C) 96. D) 24. Show Answer Correct Answer: D) 24. 15. The principles of probability can be used to A) Determine which species should be used in genetic crosses. B) Predict the traits of the offspring of genetic crosses. C) Determine the actual outcomes of genetic crosses. D) Decide which organisms are best to use in genetic crosses. Show Answer Correct Answer: B) Predict the traits of the offspring of genetic crosses. 16. Hybrid has the same meaning as ..... A) Heterozygous. B) Homozygous. C) Purebred. D) None of above. Show Answer Correct Answer: A) Heterozygous. 17. If a brown-eyed girl's father has blueeyes, and her mother has brown eyes, she ismost likely ..... for the eye color trait. A) Not enough information to determine. B) Homozygous dominant. C) Homozygous recessive. D) Heterozygous. Show Answer Correct Answer: D) Heterozygous. 18. Australian Shepherds are a breed of dogs whose coat color is directly impacted by two different genes. The gene that determines basic coat color exhibits a dominant allele (B) for black coat color and a recessive allele (b) for red coat color. Additionally, these dogs can have a solid coat color (mm) or a mixed pattern coat color called merle (Mm). The homozygous dominant coat color is called a lethal white (MM) which produces pups that are deaf and blind. What is the probability that two red Australian shepherds will produce a black pup? A) 3/4. B) 1/4. C) 0. D) 1/2. Show Answer Correct Answer: C) 0. 19. The physical expression of a trait in an organism is known as the - A) Chromosome. B) Genotype. C) Phenotype. D) Double helix. Show Answer Correct Answer: C) Phenotype. 20. What type of traits "show up" in a population more often? A) Dominant. B) Recessive. C) Punnett squares. D) Alleles. Show Answer Correct Answer: A) Dominant. 21. One cat has a heterozygous genotype, black fur (Bb), and its mate has a homozygous genotype grey fur (bb). Use a Punnett square to determine the probability of one of their offspring having grey fur. A) 25%. B) 100%. C) 75%. D) 50%. Show Answer Correct Answer: D) 50%. 22. What is the phenotypic ratio of a cross between two guinea pigs who are heterozygous for black fur and short hair (BbLl). A) 1:2:1. B) 9:3:3:1. C) 3:1. D) 0:8:0:8. Show Answer Correct Answer: B) 9:3:3:1. 23. What is the probability that a single coin flip will come up heads? A) 1 in 10 or 10%. B) 1 in 2 or 50%. C) 1 in 4 or 25%. D) 1 in 8 or 12.5%. Show Answer Correct Answer: B) 1 in 2 or 50%. 24. If you cross two heterozygous traits (Rr x Rr), as Mendel did in his second experiment, what ratio will you get between offspring with the dominant and recessive phenotypes A) 4:1. B) 2:1. C) 3:1. D) 1:1. Show Answer Correct Answer: C) 3:1. 25. When Mendel worked with pea plants, he noticed that some traits, like round seeds, seemed to hide other traits, like wrinkled seeds. What do we call the trait that hides or masks another trait? A) A recessive trait. B) A dominant trait. C) DNA replication. D) Incomplete dominance. Show Answer Correct Answer: B) A dominant trait. 26. Traits that are produced by several genes are A) Haploid. B) Polygenic. C) Diploid. D) Codominant. Show Answer Correct Answer: B) Polygenic. 27. Phenotypes refer to the A) Karyotype of chromosomes. B) Way we write the allele in symbols (RR, rr). C) Physical trait we see (eye color, hair color, bending thumb). D) None of above. Show Answer Correct Answer: C) Physical trait we see (eye color, hair color, bending thumb). 28. In pea plants, green is dominant to yellow. A green pea plant (Gg) is crossed with a yellow pea plant (gg). What is the probability that an offspring will be yellow? A) 100%. B) 25%. C) 75%. D) 50%. Show Answer Correct Answer: D) 50%. 29. Many plant species are capable of producing offspring through self-pollination. In self-pollination, gametes formed by meiosis and are used to fertilize egg cells from the same plant. Which of the following statements describes why offspring produced through self-pollination can exhibit genetic diversity? A) The genes found in each gamete will be genetically identical to one another. B) The self-pollination gametes are produced through meiosis and have undergone DNA replication. C) Homologous chromosomes were sorted into different gamete cells causing separation of allele pairs. D) Gametes involved in self-pollination only travel a short distance prior to becoming involved in fertilization. Show Answer Correct Answer: C) Homologous chromosomes were sorted into different gamete cells causing separation of allele pairs. 30. When 2 alleles do not blend but are both fully expressed (i.e. IAIB blood type), it is called ..... A) Sex-Linked. B) Complete Dominance. C) Incomplete Dominance. D) Codominance. Show Answer Correct Answer: D) Codominance. ← 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