bio back test 3

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melissag94
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246541
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bio back test 3
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2013-11-12 15:57:19
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bio exam
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bio back test
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  1. which genotype is homozygous?
    • AA x BB
    • aa x bb
  2. when the alleles for a gene are both expressed at the same time, we refer to this type of inheritance as?
    incomplete dominance
  3. the number of alleles/genes is
    several
  4. all normal humans have ___ chromosomes of each and every type
    2
  5. a man with type A blood marries a woman with type A blood. What are the chances of them having a child with type AB blood?
    o%
  6. in which kind of cross would you expect to find 9/3/3/1 ration in the F2 offspring?
    dihybrid cross
  7. two individuals are crossed: Aa x Aa. The recessive phenotype would be found in ____ of the offspring
    25%
  8. a man with type A blood marries a woman with type O blood. All the children have type O blood. Is this possible?
    no, A blood is a dominant gene
  9. a man with type AB blood marries a woman with type O blood. They have 2 children and adopt a 3rd. Which child is adopted?
    if they put blood type it is the child with O blood otherwise, not enough info
  10. dominant alleles are always expressed?
    true
  11. galactosemia is a genetic disorder involving the inability to metablize the sugar galactose. The disease (phenotype) is recessive, if one parent is a carrier (Aa) and the other is normal (AA), what are the chances of them having a galactosemic child?
    0%
  12. In a dihybrid cross between 2 individuals both heterozygous for 2 traits carried on non homologous chromosomes (AaBb x AaBb) What are the chances of having a homozygous recessive in the progeny?
    1/16= 6.25%
  13. a 3/1 ratio in the F2 generation is a ____ ratio
    phenotypic
  14. the human genome is composed of approximately ____ genes
    25,000 - 27,000
  15. biologically, cancer is uncontrolled ____
    mitosis
  16. RNA molecules leave the nucleus via the?
    mRNA
  17. DNA replication requires
    • DNA polymerase to catalyze enzymes
    • knows instructions
  18. which type of nucleic acid is not found in both the cytoplasm and the nucleus?
    RNA
  19. the process of translation does not require
    DNA template
  20. the UV used in tanning booths is not carcinogenic?
    false
  21. which genetic disorder is a lysosomal disease?
    tay sachs
  22. In human genetics, x linked recessive traits are always expressed in males. This means the defective gene is carried on the Y chromosome. T OR F?
    false
  23. a galactosemic individual cannot metabolize ____ normally
    lactose milk sugar
  24. which genetic disorder is characterized by late on set of the symptoms?
    huntingtons disease
  25. the defective gene that causes hemophilia A is carried on the autosome (somatic chromosome) T OR F?
    false, carried on x linked chromosome
  26. thymine dimmers form by exposing DNA to a UV light T OR F
    true
  27. in a trihybrid cross (AaBbTt x AaBbTt), how many individuals would you predict would be homozygous dominant for all three traits?
    3/4 x 3/4 x 3/4 = 27/64
  28. a jewish man and woman fall in love, get married and are thinking about having children. Tay sachs disease is known in the man's family and is unknown in the woman's family. Do they have to be concerned about having a tay sachs child?
    yes, the women could have a history with it
  29. eye color in humans is controlled by a single gene, with two alleles T OR F
    false, 15 genes
  30. susceptibility to skin cancer is directly related to the complexion type, ie light skinned individuals have a lower risk than darker skinned individuals
    false due to melanin
  31. genes are?
    • inheritable traits
    • found at a specific location onĀ a chromosomes
    • sequences of nucleotides on a DNA molecule
  32. test crosses are required to determine the genotype of homozygous recessive individuals, t or f
    false, dominant
  33. dominant alleles are?
    always expressed
  34. which technique can be used to separate the components of a complex mixture of relatively small organic molecules from each other?
    thin layer of chromatography
  35. which technique is used to separate proteins from each other on basis of molecular mass?
    electrophoresis
  36. in the electrophoresis exercise, the protein profiles of the red and yellow shelled glyptodonts were the same, t or f?
    false
  37. a gene can have ___ alleles
    several
  38. dominant traits are inherently desirable, t or f?
    true
  39. recessive traits are inherently undesirable?
    true
  40. genotype refer to ____ an organism possesses with respect to some particular trait
    genes
  41. if two red shelled glyptodonts have a yellow shelled offspring....
    each parent has a a recessive allele for shell color
  42. in glyptodonts, shell color is an inherited trait, t or f
    true
  43. when two yellow shelled glyptodonts mate, their offspring will always have yellow shells, t or f
    true
  44. in glyptodonts, shell color is under control of ___ gene
    1
  45. in glyptodonts, the gene controlling shell has ___ alleles
    2
  46. based on the results of your chromatography experiments, does the gray pigment appear to be under control of the gene for shell color?
    no
  47. recessive alleles are always expressed, t or f?
    false
  48. red shelled glyptodonts are always homozygous dominant for shell color, t or f?
    false
  49. what is the probability of two yellow shelled glyptodonts having a red shelled offspring?
    0%
  50. if a female parent is a carrier, due to the presence of one copy of the recessive hemophilia A allele being carried on the X chromosome, what are the odds that she could have an affected male child?
    50%
  51. if all 13 CODIS markers are used to compare DNA samples, the chances that a match is due to chance is approx.?
    50%
  52. if both parents exhibit a recessive trait, what is the chance that their offspring will exhibit the dominant phenotype?
    0%
  53. in a dihybrid cross, between two individualsĀ  both heterozygous for two traits carried on nonhomologous chromosomes (AaBb x AaBb), what are the chances of having progeny that exhibit both dominant phenotypes?
    9/16 = 56%
  54. A 1/2/1 ratio in the F2 generation is a ____ ratio
    genotypic
  55. phenotype determines genotype, t or f?
    false
  56. crossing over occurs during?
    prophase I
  57. human sperm cells carry ____ chromosomes of each and every type
    1
  58. crossing over tends to ___ genetic diversity
    increase
  59. after meiosis, each haploid gamete carries one allele for each inherited trait
    true
  60. a recessive phenotype is only expressed in the __ condition
    homozygous
  61. when is the phenotypic ratio of the F2 is identical to genotypic ratio?
    when the alleles are incompletely dominant
  62. alleles are?
    alternative forms of the same gene
  63. oogenesis and spermatogenesis utilize
    meiosis
  64. mendel concluded that genes were particulate units of inheritance
    true
  65. if the probability of event A happening is 80%, you can expect the event to occur four times out of ?
    5
  66. bacteria divide by
    binary fission
  67. rabies is a bacterial disease, t or f?
    false
  68. in the urey/miller experiment, primordial life was created
    false
  69. most heterotrophic bacteria are involved in the process of decomposition, t or f?
    true
  70. human eye color is under the control of ___ genes
    15

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