This quiz works best with JavaScript enabled. Home > Agriculture > Plant > Genetics > Principles Of Genetics – Quiz 23 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Principles Of Genetics Quiz 23 (30 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. An allele represented by a capital letter. Masks or overshadows the weaker allele. A) Big. B) Recessive. C) Dominant. D) Small. Show Answer Correct Answer: C) Dominant. 2. When do the symptoms of Huntington's appear? A) 10 - 30 years old. B) 30 - 50 years old. C) 0 - 10 years old. D) 50 - 70 years old. Show Answer Correct Answer: B) 30 - 50 years old. 3. Mendel's principle of independent assortment states that ..... A) Phenotypes are typically identical in offspring of the F1 generation. B) Genes for different traits always stay together during the formation of gametes. C) Students who are cunning and resourceful are placed in Slytherin House. D) Genes for different traits can segregate independently during the formation of gametes. Show Answer Correct Answer: D) Genes for different traits can segregate independently during the formation of gametes. 4. In regards to genetics ..... what is the principle of dominance? A) Larger zebras will out compete their smaller counterparts for food. B) Recessive alleles will "beat out" the dominant allele 75% of the time. C) Some genes are almost always inherited together. D) Some alleles are dominant and others are recessive. Show Answer Correct Answer: D) Some alleles are dominant and others are recessive. 5. Which of the following is NOT an inherited trait? A) Reading ability. B) Hair color. C) Eye color. D) Blood type. Show Answer Correct Answer: A) Reading ability. 6. What was the ratio of Mendel's F2 generation for the two-factor cross? A) 9:6:3:1. B) 8:4:2:1. C) 4:3:2:1. D) 9:3:3:1. Show Answer Correct Answer: D) 9:3:3:1. 7. Co dominance means A) Progeny resembles one of the parent. B) Progeny resembles none of the protein. C) Progeny resembles both parents. D) Progeny is a blend of both parents. Show Answer Correct Answer: C) Progeny resembles both parents. 8. A hybrid is the offspring of parents that have ..... alleles for a trait. A) Two. B) The same. C) Different. D) Four. Show Answer Correct Answer: C) Different. 9. Features such as height, color, shape A) Trait. B) Charateristic. C) Alleles. D) Genetics. Show Answer Correct Answer: B) Charateristic. 10. Select the correct genotype:Homozygous Dominant A) Hh. B) Gg. C) Ff. D) DD. Show Answer Correct Answer: D) DD. 11. The passing on of traits from parents to their offspring A) Heredity. B) Hereditary. C) Genes. D) None of above. Show Answer Correct Answer: A) Heredity. 12. The physical appearance of the allele combination the offspring receives A) Dominant. B) Genotype. C) Homozygous. D) Phenotype. Show Answer Correct Answer: D) Phenotype. 13. Two chromosomes that are similar in size and structure are called A) Sex chromosomes. B) Sister chromatids. C) Homozygous chromatids. D) Homologous chromosomes. Show Answer Correct Answer: D) Homologous chromosomes. 14. Why might potential parents get genetic testing done on themselves before having a baby together? A) Doctors could predict likely mutations leading to extraordinary abilities in the children. B) So they could tell if their potential mate had plastic surgery to improve their looks. C) Genetic testing is not possible in today's medical environment but may be within the next 50 years. D) They could discover if their baby might be born with genetic disorders. Show Answer Correct Answer: D) They could discover if their baby might be born with genetic disorders. 15. How many chromosomes are in a sex cell? A) 46. B) 23. C) 43. D) 26. Show Answer Correct Answer: B) 23. 16. All humans have at least one X gene. Choose the answer below that explains why all humans do NOT have a y gene A) Females pass on only a Y to male offspring. B) Males pass on X genes to all offspring. C) Females pass on X genes to all offspring. D) Males pass on a Y to male offspring and an X to female offspring. Show Answer Correct Answer: D) Males pass on a Y to male offspring and an X to female offspring. 17. Whats a pedigree? A) In genetics a type of family tree that maps the occurrence of a trait in a family. B) A contract. C) Written description of all genes worldwide. D) None of above. Show Answer Correct Answer: A) In genetics a type of family tree that maps the occurrence of a trait in a family. 18. Specific characteristic determined by a biological factor A) Trait. B) Gene. C) Allele. D) Hybrid. Show Answer Correct Answer: A) Trait. 19. What is genotypic ratio of incomplete dominance A) 3:1. B) 16:1. C) 1:3:1. D) 1:2:1. Show Answer Correct Answer: D) 1:2:1. 20. How many letters does a genotype contain? A) 3. B) 4. C) 1. D) 2. Show Answer Correct Answer: D) 2. 21. Mark is heterozygous. If B is for brown hair, and b is for blonde hair, what is Mark's phenotype? A) Brown Hair. B) Blonde Hair. C) Brown and Blonde Hair. D) Black Hair. Show Answer Correct Answer: A) Brown Hair. 22. Albinism is due to A) Presence of melanin. B) Absence of vitamins. C) Absence of melanin. D) Absence of hormone. Show Answer Correct Answer: C) Absence of melanin. 23. What determines the genotype of an organism? A) The alleles that are passed from parents to offspring. B) The amount of sleep the organism gets. C) The number of children the organism has. D) The foods the organism eats during its life. Show Answer Correct Answer: A) The alleles that are passed from parents to offspring. 24. A white rose and a red rose produce a pink rose, which type of inheritance does this show? A) Incomplete dominance. B) Codominance. C) Multiple alleles. D) Polygenic inheritance. Show Answer Correct Answer: A) Incomplete dominance. 25. In pea plants, the trait for tall stems is dominant over the trait for short stems. If two heterozygous tall plants are crossed, what percentage of the offspring would be expected to have the same phenotype as the parents? A) 75%. B) 25%. C) 100%. D) 50%. Show Answer Correct Answer: A) 75%. 26. In a pedigree, a square represents a A) Adult. B) Male. C) Child. D) Female. Show Answer Correct Answer: B) Male. 27. An Tt plant crosses with another Tt plant. What geonotypes would expect the offspring to have? A) All TT. B) All Tt. C) Some TT and some Tt. D) Some TT some Tt and some tt. Show Answer Correct Answer: D) Some TT some Tt and some tt. 28. Which option below best describes polygenic inheritance? A) More than one set of genes contributing to the phenotype. B) A blending of genes getting an intermediate phenotype. C) A phenotype that has more than 2 possible alleles for a gene. D) None of above. Show Answer Correct Answer: A) More than one set of genes contributing to the phenotype. 29. What is the chemical called that is found inside our cell's nucleus and determines our inherited traits? A) Chloroplast. B) Genes. C) D.N.A. D) Chromosomes. Show Answer Correct Answer: C) D.N.A. 30. Whats co-dominance? A) Describes an allele that masks the phenotypic effect of the other. B) The case in which the hetero-zygote displays characteristics of both alleles. C) Describes the genotype of a trait for which the two alleles an individual carries are the same. D) None of above. Show Answer Correct Answer: B) The case in which the hetero-zygote displays characteristics of both alleles. ← 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