Practice Exam 2

Practice Exam 2 - Practice Exam 2 1. The only trait that...

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Practice Exam 2 1. The only trait that appears in the first filial generation from the cross of true-breeding parents is dominant. a) True b) False 2. In a simple monohybrid cross, the genotypic ratio of the F2 generation according to Mendelian genetics is: a) 1:2:1 b) 3:1 c) 1:1 d) 4:0 e) None of the above 3. The phenotypic ratio seen in a dihybrid cross to produce the F2 progeny in which the law of independent assortment holds true would be: a) 1:2:1 b) 3:1 c) 9:3:3:1 d) 9:3:4 e) None of the above 4. Two alleles separating during meiosis to produce gametes refers to: a) Particulate Theory b) Law of Segregation c) Law of Independent Assortment d) Recombination
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e) None of the above 5. In epistasis, a) Nothing changes from generation to generation. b) One gene influences the expression of another. c) A portion of a chromosome is inverted. d) The behavior of two genes is entirely independent. e) One gene is dominant to another gene 6. In humans, spotted teeth are caused by a dominant sex-linked gene. A man with spotted teeth whose mother had normal teeth marries a woman with normal teeth. Therefore, a) All of their daughters will have normal teeth. b) All of their daughters will have spotted teeth. c) All of their children will have spotted teeth. d) Half of their sons will have spotted teeth. e) All of their sons will have spotted teeth. 7. Linked genes a) Never show crossing over b) Must be immediately adjacent to one another on a chromosome c) Have alleles that assort independently of one another d) Are on the same chromosome e) Always have multiple alleles 8. Which statement about a testcross is not true ? a) It tests whether an unknown individual is homozygous or heterozygous. b) The test individual is crossed with a homozygous recessive individual.
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c) If the test individual is heterozygous , the progeny will have a 1:1 ratio. d) If the test individual is homozygous , the progeny will have a 3:1 ratio. e) Test cross results are consistent with Mendel’s model of inheritance. 9. In a simple Mendelian monohybrid cross, tall plants are crossed with short plants, and the F1 plants are allowed to self-pollinate. What fraction of the F2 generation are both tall and heterozygous? a) 1/8 b) ¼ c) 1/3 d) 2/3 e) ½ 10. The genetic sex of birds is determined by: a) Ploidy, with the male being haploid b) The SRY gene on the Y chromosome c) X and Y chromosome, the male being XX d) Z and W chromosomes, the male being ZW e) None of the above 11. The phenotype of an individual… a) Depends at least in part on the genotype b) Is either homozygous or heterozygous c) Determines the genotype d) Is the genetic composition of the individual e) A and B
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12. The ABO blood groups in humans are determined by a multiple-allele system in which I A and I B are codominant and dominant to i O . A newborn infant is type A. The mother is type O. Possible genotypes of the father are: a) A, B, or AB b) A, B, or O c) O only d) A or AB e) A or O 13. In Drosophila melanogaster , white (
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This note was uploaded on 05/07/2008 for the course BIO 1306 taught by Professor Adair,tamarah during the Spring '08 term at Baylor.

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Practice Exam 2 - Practice Exam 2 1. The only trait that...

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