This quiz works best with JavaScript enabled. Home > Plant > Principles Of Genetics – Quiz 45 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Principles Of Genetics Quiz 45 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The allele for cheek dimples (D) is dominant to the allele for no cheek dimples (d). Ben and Melissa both have dimples. Ben's genotype is DD and Melissa's genotype is Dd.What percentage of Ben and Melissa's future children will have dimples? A) 0%. B) 25%. C) 50%. D) 100%. Show Answer Correct Answer: D) 100%. 2. DNA Fingerprinting A) Tool used by biologists that analyzes an individual's unique collection of DNA restriction fragment; used to determine whether two samples of genetic material are from the same person. B) The technique used by biologists to make many copies of a particular gene. C) Glass slide or silicon cup that carries thousands of different kinds of single- stranded DNA fragments arranged in a grid. A DNA microarray is used to detect and measure the expression of thousands of genes at one time. D) None of above. Show Answer Correct Answer: A) Tool used by biologists that analyzes an individual's unique collection of DNA restriction fragment; used to determine whether two samples of genetic material are from the same person. 3. A single gene has 3 or more alleles. These are called A) Multiple genes. B) Multiple alleles. C) Codominance. D) Polygenic traits. Show Answer Correct Answer: B) Multiple alleles. 4. Sex Chromosomes A) Offspring of crosses between parents with different traits. B) One of two chromosomes that determines an individual's sex. C) Chromosome that is not a sex chromosome; also called autosomal chromosome. D) None of above. Show Answer Correct Answer: B) One of two chromosomes that determines an individual's sex. 5. How do geneticists use Punnett Squares? A) To predict outcomes of genetic crosses. B) To predict which traits will be dominant. C) To predict if two genes can be crossed. D) To predict which traits will be recessive. Show Answer Correct Answer: A) To predict outcomes of genetic crosses. 6. Green peas are dominant (G) to yellow peas (g). What is the genotype for a hetereozygous dominant offspring? A) Gg. B) Gg. C) GG. D) None of above. Show Answer Correct Answer: A) Gg. 7. A HETEROZYGOUS individual would have the genotype: A) Hh. B) Hh. C) HH. D) Hi. Show Answer Correct Answer: A) Hh. 8. What does homozygous mean? A) An organism has two identical alleles for a trait. B) An organism has two different alleles for a trait. C) The physical characteristics of a trait. D) The actual genetic makeup of a characteristic. Show Answer Correct Answer: A) An organism has two identical alleles for a trait. 9. One of two chromosomes that determines an individual's sex A) Sex Chromosome. B) Autosome. C) Sex-Linked Gene. D) Genome. Show Answer Correct Answer: A) Sex Chromosome. 10. Which of the following best explains the results of letting the F1 purple hybrids self pollinate? A) 100% Purple. B) 100% White. C) 50% Purple, 50% White. D) 75% Purple, 25% White. Show Answer Correct Answer: D) 75% Purple, 25% White. 11. What is cross pollination? A) When pollen from a flower fertilizes itself or another flower on the same plant. B) When pollen from one flower fertilizes a flower on a different plant. C) A plant whose offspring share the same traits as the parent. D) A plant whose offspring is genetically different from the parent. Show Answer Correct Answer: B) When pollen from one flower fertilizes a flower on a different plant. 12. Incomplete dominance means that the traits are A) Expressed equally. B) Dominant. C) Recessive. D) Blended. Show Answer Correct Answer: D) Blended. 13. How did Gregor Mendel discover the basic principles of genetics? A) Study of pea plants. B) Study of mice. C) Study of corn. D) Study of bats. Show Answer Correct Answer: A) Study of pea plants. 14. Coat color in cats is a sex-linked trait controlled by two genes, black and orange-brown, located on the X chromosome. Heterozygous cats will have a calico color, and homozygous cats will be black if they received the black gene or orange-brown if they received the orange-brown gene. If a black male and an orange-brown female have kittens, what percentage of male kittens would be expected to have the calico color? A) 0%. B) 25%. C) 50%. D) 75%. Show Answer Correct Answer: A) 0%. 15. Hemophilia is a x-linked disorder. A woman is a carrier for the disorder. Which is the correct genotype? A) Hh. B) XHXh. C) Hh. D) XhXh. Show Answer Correct Answer: B) XHXh. 16. Scientific studies show that identical twins who were separated at birth and raised in different homes may vary in height, weight, and intelligence. The most probable explanation for these differences is that ..... A) Original genes of each twin increased in number as they developed. B) One twin received genes only from the mother while the other twin received genes only from the father. C) Environments in which they were raised were different enough to affect the expression of their genes. D) Environments in which they were raised were different enough to change the genetic makeup of both individuals. Show Answer Correct Answer: C) Environments in which they were raised were different enough to affect the expression of their genes. 17. A cross that involves a single inheritable trait is called a ..... cross A) Dihybrid. B) Test. C) Monohybrid. D) Mendelian. Show Answer Correct Answer: C) Monohybrid. 18. The sex of a person depends on A) The genetic makeup of autosomes found in the egg cell. B) The genetic makeup of autosomes found in the sperm cell. C) Whether the unfertilized egg contains an X or Y-chromosome. D) Whether the sperm that fertilizes the egg contains an X or Y-chromosome. Show Answer Correct Answer: D) Whether the sperm that fertilizes the egg contains an X or Y-chromosome. 19. Genetic Marker A) The technique used by biologists to make many copies of a particular gene. B) DNA produced by combining DNA from different sources. C) Alleles that produce detectable phenotypic differences useful in genetic analysis. D) None of above. Show Answer Correct Answer: C) Alleles that produce detectable phenotypic differences useful in genetic analysis. 20. A Punnett Square shows all the following EXCEPT A) All possible results of a genetic cross. B) The genotypes of the offspring. C) The genotypes of each parent. D) The actual results of a genetic cross. Show Answer Correct Answer: D) The actual results of a genetic cross. ← 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