Genetics test 2 real

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kingbken
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Genetics test 2 real
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2011-12-16 01:58:35
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Genetics test 2 real
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  1. Crossing over between homologous chromosomes occurs at which of the following stages of meiosis?
    A. prophase II
    B. metaphase I
    C. anaphase I
    D. prophase I
    E. S
    D. prophase I
    (this multiple choice question has been scrambled)
  2. The map of a chromosome interval is Q 10 R 40S. Which interval would likely show the higher ratio of double to single chiasmata?
    A. Q-R
    B. Two chiasmata never occur in the same interval.
    C. R-S
    D. The ratios would be the same in the 2 intervals.
    C. R-S
    (this multiple choice question has been scrambled)
  3. Suppose a three-point testcross was conducted involving the genes X, Y, and Z. If the most abundant classes are XYZ and xyz and the rarest classes are XyZ and xYz, which gene is in the middle?
    A. cannot be determined
    B. Z
    C. X
    D. Y
    D. Y
    (this multiple choice question has been scrambled)
  4. Alternative resolution of the Holliday intermediate are responsible for whether or not crossing over occurs.
    a. True
    b. False
    a. True
  5. DNA replication occurs through a ___ process.
    A. transferal
    B. conservative
    C. semiconservative
    D. dispersive
    E. None of the choices is correct.
    C. semiconservative
    (this multiple choice question has been scrambled)
  6. The term mutation refers to
    A. a heritable change in the DNA of a cell
    B. any change in the DNA of cell
    C. any change in the cell that changes its survival chances
    D. only changes in the DNA that result in new phenotypes
    E. only changes in the DNA that result in novel proteins
    A. a heritable change in the DNA of a cell
    (this multiple choice question has been scrambled)
  7. In animal gametogenesis, a single primary spermatocyte generates ____ sperm, while a single primary oocyte generates ______ egg(s).
    A. 4,2
    B. 1,4
    C. 1,1
    D. 4,4
    E. 4,1
    E. 4,1
    (this multiple choice question has been scrambled)
  8. A female that is XXO has Turner Syndrome.
    a. True
    b. False
    b. False
  9. In tetrad analysis, NPD asci result from
    A. single crossovers between a gene and a centromere
    B. double crossovers between linked genes
    C. independent assortment of unlinked genes or double crossovers between linked genes
    D. single crossovers between linked genes
    E. independent assortment of unlinked genes
    C. independent assortment of unlinked genes or double crossovers between linked genes
    (this multiple choice question has been scrambled)
  10. A hypothesis that predicts no linkage between genes is called the ___ hypothesis.
    A. alternative
    B. Chi square
    C. null
    d. None of the above
    C. null
    (this multiple choice question has been scrambled)
  11. The ratio of ___ is 1:1.
    A. guanine to adenine
    B. None of the choices is correct
    C. uracil to cytosine
    D. adenine to thymine
    E. cytosine to adenine
    D. adenine to thymine
    (this multiple choice question has been scrambled)
  12. A cross between a white-eyed female fruit fly and a red-eyed male would generate which of the following types of progeny?
    A. all red-eyed males and a 50:50 mixture of white-eyed and red-eyed females
    B. The result cannot be predicted because it depends on whether the female is homozygous or heterozygous
    C. red-eyed females and white-eyed males
    D. white-eyed females ad red-eyed males
    E. all red-eyed females and a 50:50 mixture of white-eyed and red-eyed males
    B. The result cannot be predicted because it depends on whether the female is homozygous or heterozygous.
    (this multiple choice question has been scrambled)
  13. Recombination frequencies near 50% suggest that
    A. two genes are on different chromosomes
    B. two genes are on the same chromosome but lie very far apart
    C. two genes lie very close together on the same chromosome
    D. two genes are on the different chromosomes, or two genes are on the same chromosome but lie very far apart
    D. two genes are on different chromosomes, or two genes are on the same chromosome but lie very far apart
    (this multiple choice question has been scrambled)
  14. Crossing over takes place in tetrads consisting of ____ chromatids, and involves ___ of the chromatids.
    A. 4,4
    B. 4,2
    C. 2,2
    D. 8,4
    E. 2,4
    B. 4,2
    (this multiple choice question has been scrambled)
  15. Meselson and Stahl relied on equilibrium density gradient centrifugtion in a ___ solution to resolve the DNA containing 14N from the DNA containing 15N.
    A. radiolabeled phosphate
    B. cesium chloride
    C. radiolabeled nitrogen
    D. calcium chloride
    E. sodium acetage
    B. cesium chloride
    (this multiple choice question has been scrambled)
  16. How many replication forks depart from an origin of replication?
    A. two
    B. one
    C. none of the choices is correct
    D. three
    E. four
    A. two
    (this multiple choice question has been scrambled)
  17. Which of the following terms describes the mutation of a mutant allele to a wild-type allele?
    A. inversion
    B. complementation
    C. auxotrophic
    D. forward mutation
    E. back mutation
    E. back mutation
    (this multiple choice question has been scrambled)
  18. Nondisjunction can occur at either the first or second division of meiosis. XYY individuals would most likely arise from nondisjunction at the meiotic division in the ____.
    A. first, mother
    B. More than one of the choices give rise to XYY individuals
    C. second, father
    D. first, father
    E. second, mother
    C. second, father
    (this multiple choice question has been scrambled)
  19. Which of the following processes can generate recombinant gametes?
    A. independent assortment of two unlinked heterozygous loci
    B. crossing over between 2 linked heterozygous loci and independent assortment of 2 unlinked heterozygous loci
    C. segregation of alleles in a heterozygote
    D. crossing over between 2 linked heterozygous loci
    E. segregation of alleles in a heterozygote, crossing over between two linked heterozygous loci and independent assortent of two unlinked heterozygous loci
    B. crossing over between 2 linked heterozygous loci and independent assortment of 2 unlinked heterozygous loci
    (this multiple choice question has been scrambled)
  20. Ascospores are haploid cells that can germinate, replicate by mitosis, and survive as haploid individuals.
    a. True
    b. False
    a. True
  21. recombination involves the breakage and reunion of DNA molecules from
    A. homologous nonsister chromatids
    B. heterologous sister chromatids
    C. heterologous nonsister chromatids
    D. None of the choices is correct
    E. homologous sister chromatids
    A. homologous nonsister chromatids
    (this multiple choice question has been scrambled)
  22. The protein that progressively unwinds DNA ahead of each replication fork is called
    A. primase
    B. topoisomerase
    C. helicase
    d telomerase
    e. ligase
    C. helicase
    (this multiple choice question has been scrambled)
  23. Red green color blindness is controlled by an X chromosome gene in humans. A normal man and normal woman whose fathers are both color blind marry. What is the probability that their first child will be color blind?
    A. 0
    B. 1/4
    C. 1/2
    D. 1/3
    E. 1/8
    B. 1/4
    (this multiple choice question has been scrambled)
  24. If the map distance between genes A and B is 10map units and the map distance between genes B and C is 25 map units, what is the map distance between A and C?
    A. 15 map units
    B. 35 map units
    C. either 15 map units or 35 map units, depending on the order of the genes
    D. The map distance between A and C cannot be predicted from these data
    C. either 15 map units or 35 map units, depending on the order of the genes
    (this multiple choice question has been scrambled)
  25. A tetrad that contains all recombinant class haploid cells is known as a parental ditype.
    a. True
    b. False
    b. False
  26. Which of the following is NOT involved in ensuring the accuracy of a cell's genetic information?
    A. precision of replication machinery
    B. redundancy
    C. DNA polymerase proofreading mechanism
    D. ligases
    D. ligases
    (this multiple choice question has been scrambled)
  27. Eukaryotic chromosomes have evolved special structures at the ends of chromosomes to ensure the replication of the two ends of linear chromosomes. These structures are called
    A. ligases
    B. telomeres
    C. single-stranded binding proteins
    D. methylases
    E. capping proteins
    B. telomeres
    (this multiple choice question has been scrambled)
  28. A missense mutation is one that creates a premature stop codon.
    a. True
    b. False
    b. False
  29. What type of chromosome provides the basis for sex determination in many sexually reproducing organisms?
    A. diploid
    B. homologous chromosomes
    C. autosomes
    D. haploid
    E. sex chromosomes
    A. sex chromosomes
    (this multiple choice question has been scrambled)
  30. Humans have 22 pairs of autosomes plus one sex chromosome pair. How many autosomes are present in a normal human primary spermatocyte?
    A. 22
    B. 23
    C. 44
    D. 45
    c. 46
    C. 44
    (this multiple choice question has been scrambled)
  31. What happens physically during the process of crossing over?
    A. The genetic information on one chromatid is replaced by copying genetic information from a homolous chromatid without there being any physical exchange between the chromosomes.
    B. Two homologous chromatids break and rejoin at precisely the same site along the chromosome so that there is no loss or gain of material on either product.
    C. It is not known what occurs during cross over.
    D. Two homologous chromatids break and rejoin t random sites along the chromosome.
    B. Two homologous chromatids break and rejoin at precisely the same site along the chromosome so that there is no loss or gain of material on either product.
    (this multiple choice question has been scrambled)
  32. The enzymes able to relaz supercoils in DNA is called
    A. topoisomerases
    B. telomeres
    C. ligases
    D. primases
    E. helicases
    A. topoisomerases
    (this multiple choice question has been scrambled)
  33. Which of the following scientists proposed early recombination models?
    A. Franklin
    B. Watson and Crick
    C. Meselson and Stahl
    D. Holliday
    E. Chargaff
    D. Holliday
    (this multiple choice question has been scrambled)
  34. The cells in which meiosis occurs in males is referred to as
    A. spermatogonia
    B. spermatocytes
    C. oocytes
    D. sperm
    E. spermatids
    B. spermatocytes
    (this multiple choice question has been scrambled)
  35. Pyrimidines are a nitrogenous base containing a double ring, while purines contain a single ring.
    a. True
    b. False
    b. False
  36. Which of the following proteins is needed to lay down a segment of RNA complementary to the DNA before replication can proceed?
    a. DNA polymerase I
    d. DNA polymerase II
    c. DNA polymerase III
    d. primase
    d. primase
  37. Males with one copy of an X-linked gene are said to be ___ for that gene.
    A. homozygous
    B. heteroallelic
    C. hemizygous
    D. deficient
    E. heterozygous
    C. hemizygous
    (this multiple choice question has been scrambled)
  38. ____ bonds are responsible for the chemical affinity between A and T (or G and C) nucleotides.
    A. hydrogen
    B. electro-ionic
    C. None of the choices is correct
    D. ionic
    E. covalent
    A. hydrogen
    (this multiple choice question has been scrambled)
  39. In tetrad analysis, the criterion for linkage of two genes is
    A. PD>NPD
    B. PD>T
    C. PD=NPD
    D. PD=T
    E. NPD=T
    A. PD>NPD
    (this multiple choice question has been scrambled)
  40. Which of the following is not an element found in DNA?
    A. hydrogen
    B. nitrogen
    C. sulfur
    D. phosphorous
    E. oxygen
    C. sulfur
    (this multiple choice question has been scrambled)
  41. Without ____ regions on the DNA during recombination, gene conversion could not occur.
    A. None of the choices is correct.
    B. heterotriplex
    C. homoduplex
    D. heteroduplex
    E. homotriplex
    D. heteroduplex
    (this multiple choice question has been scrambled)
  42. Premeiotic germ cells that divide mitotically in females are referred to as
    A. ootids
    B. secondary oocytes
    C. primary oocytes
    D. oogonia
    E. ova
    D. oogonia
    (this multiple choice question has been scrambled)
  43. Hersey and Chase relied on ___ to physically separate the infected bacterial cells from the phage coats.
    A. None of the choices is correct
    B. gel filtration
    C. centrifugation
    D. radioactivity
    E. ion exchange
    C. centrifugation
    (this multiple choice question has been scrambled)
  44. If 40% of the bases in a region of the mouse genome are cytosine, what percentage in that region are adenine?
    A. 20%
    B. 60%
    C. 10%
    D. 15%
    C. 10%
    (this multiple choice question has been scrambled)

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