Chapter 15 Vocab

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DesLee26
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Chapter 15 Vocab
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2011-02-03 21:24:44
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AP Bio
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  1. a basic principle in biology stating that genes are located on chromosomes and that the behavior of chromosomes during meiosis accounts for inheritance patterns
    -- Mendelian genes have specific loci along chromosomes, and it is the chromosomes that undergo segregation and independent assortment
    chromosome theory of inheritance
  2. the two alleles for each gene separate during gamete formation
    law of segregation
  3. alleles of genes on nonhomologous chromosoems assort independently during gamete formation
    law of independent assortment
  4. traits that are alternatives to the wild type because they are due to alleles assumed to have originated as changes, or mutations in the wild-type allele
    mutant phenotypes
  5. changes
    mutations
  6. what is symbolized by a lowercase letter?
    mutant phenotype
  7. what is symbolized by a lowercase letter with a superscript +
    wild type trait
  8. an individual with the phenotype most commonly observed in natural populations; also refers to the phenotype itself
    wild type
  9. the chromosomal system located in humans?
    grasshoppers?
    chickens?
    ants and bees?
    • X-Y
    • X0
    • Z-W
    • haplo-diplo system
  10. a gene located on the Y chromosome required for the development of testes; in its absence, gonads develop into ovaries
    SRY (sex-determining region of Y)
  11. a gene located on either sex chromosome (usually the X chromosome), resulting in a distinctive pattern of inheritance
    sex-linked gene
  12. For males, because they only have one locus, __ is used for describing the phenotype/ genotype
    hemizygous
  13. __ discovered the existence of sex-linked genes.
    Thomas Hunt Morgan
  14. A human genetic disease caused by a sex-linked recessive allele; characterized by progressive weakening and a loss of muscle tissue; loss of coordination; affected individuals rarely live past their early 20s
    Duchenne muscular dystrophy
  15. sex-linked disorder characterized by hving blood with an inability to clot normally, caused by the absence of proteins required for blood clotting; human genetic disease caused by a sex-linked recessive allele resullting in the absence of one or more blood-clotting proteins; characterized by excessive bleeding following injury
    hemophilia
  16. __ regulates gene dosage in females. Although female mammals inherit two X chromosomes, one of the X chromosomes (randomly chosen) in each cell of the body becomes inactivated during embryonic development by methylation. As a result, males and females have the same effective dose of genes with loci on the X chromosome
    X-inactivation
  17. a dense/ compact object lying along the inside of the nuclear envelope in cells of female mammals, representing a highly condensed, inactivated X chromosome
    Barr body
  18. a condition in which an organism or part is composed of two or more genetically distinct tissues owing to experimental manipulation or to faulty distribution of genetic material during mitosis
    mosaicism
  19. Females consist of a __ of two types of cells: those with the active X derived from the mom and the active X derived from the father;
    mosaic
  20. X chromosomes become inactive by addition of a __ added to a cysteine (cytosine) group that silences a gene
    methylation
  21. An X chromosome gene called __ that is active only on Barr body chromosomes
    XIST (X-inactivate-specific-transcript)
  22. two or more genes located close enough together on a chromosome that they tend to be inherited together
    linked genes
  23. a single gene on a sex chromosome
    sex-linked gene
  24. general term for the production of offspring with combinations of traits that differ from those found in either parent
    genetic recombination
  25. an offspring with a phenotype that matches one of the parental phenotypes: also refers to the phenotype itself
    parental type
  26. an offspring whose phenotype differs from that of the parents; also refers to the phenotype itself
    recombinant type
  27. a genetic map based on the frequencies of recombinatio between markers during crossing over of homologous chromosomes
    linkage map
  28. a chart of a chromosome that lcoates genes with respect to chromosomal features distinguishable with a microscope
    cytogenetic map
  29. the reciprocal exchange of genetic material between nonsister chromatids during prophase I of meiosis; accounts for the recombination of linked genes
    crossing over
  30. a unit of measurement of the distance between gneses. ONe is equivalent to a 1% recombination frequency
    map units (centrimorgans)
  31. an ordered list of the genetic loci along a particular chromosome
    genetic map
  32. Person who came up with the: the farther apart two genes are, the higher the probability that a crossover will occur between them and therefore the higher the recombination frequency
    Sturtevant
  33. an error in meiosis or mitosis in which members of a pair of homologous chromosomes or a pair of sister chromatids fail to separate properly from each other (members of a pair ofhomologous chromosoems do not separate properly during meiosis I, or sister chromatids don't separate properly during meiosis II)
    nondisjunction
  34. a chromosomal aberration in which one or more chromosoems are present in extra copies or are deificient in number; abnormal number of chromosomes
    aneuploidy
  35. referring to a cell that has only one copy of a particular chromosome instead of the normal two (2n-1)
    monosomic
  36. referring to a diploid cell that has three copies of a particular chromosome instead of the normal two (2n+1)
    trisomic
  37. condition of having more than two complete sets of chromosoems, forming a 3n or 4n individual; a chromosomal alteration in which the organism possesses more than two complete chromosome sets; result of an accident in cell division
    polyploidy
  38. 3n
    triploidy
  39. 4n
    tetraploidy
  40. 6n
    hexaploid
  41. a deficiency in a chromosome resulting from the loss of a fragment through breakage
    deletion
  42. an aberration in chromosome structure due to fusion with a fragment from a homologous chromosome, such that a portion of a chromosome is duplicated.
    duplication
  43. an aberration in chromosome structure resulting from reattachment of a chromosomal fragment in a reverse orientation to the chromosome from which it originated
    inversion
  44. an aberration in chromosome structure resulting from attachment of a chromosomal fragment to a nonhomolgous chromosomal fragment to a nonhomologous chromosome
    translocation
  45. removes a chromosomal segment; occurs when a chromosomal fragment is lost, resulting in a chromosome with missing genes
    deletion
  46. repeats a segment; when the chromosome fragment that broke off becomes attached to its sister chromatid; cause double does of genes located on that chromosome
    duplication
  47. reverses a segment within a chromosome;l chromosome fragment breaks off and reattaches to its orignial position, but backwards so that the part of the fragment that was originally at the attachment point is now at the end of teh chromosome
    inversion
  48. when hte deleted chromosome fragment joins a nonhomologous chromosome; moves a segment from one chromosome to a nonhomologous chromosome
    translocation
  49. nonhomologous chromosomes exchange frangments
    reciprocal translocation
  50. a chromosome transfers a fragment without receiving a fragment in return
    nonreciprocal translocation
  51. an aneuploid condition that is the result of having an extra chromosome 21 (trisomy 21); includes characteristic facial fetures, short stature, heart defects, and mental retardation
    Down Syndrome
  52. an aneuploid condition in which a male possesses the sex chromosomes XXY (an extra X); males have male sex organs but are sterile; moobs
    Klinefelter syndrome
  53. males with this type of aneuploid are generally taller than average
    XYY
  54. Females with this aneuploidy are healthy and cannot be distinguished from XX females except by karyotype.
    XXX
  55. a monosomic condition in which the female has just one sex chromosome, an X; these females are sterile because the reproductive organs do not mature; only known viable monosomy in humans
    Turner syndrome (X0)
  56. when does nondisjunction occur?
    anaphase I of meiosis or anaphase II
  57. pairs of homologous chromosomes dont separate properly during meiosis
    nondisjunction
  58. abnormal number of chromosomes
    aneuploidy
  59. 2n-1 (Turner Syndrome)
    monosomy
  60. 2n+1
    trisomy
  61. more than two complete sets of chromosoes
    polyplody
  62. flipping around of chromosome segment
    inversion
  63. arm above centromere is known as? below?
    • p
    • q
  64. many __ cause severe problems, such as __ resulting from a specific one in chromosome 5; child borm with this deletion is mentally retarded, has a small head with unusual facial features and has a cry that sounds like the mewing of a distressed cat
    cri-du-chat
  65. a phenomenon in which expression if an allele in offspring depends ib whether the allele is inherited from the male or female parent
    genomic imprinting
  66. __ may directly slience an allele.
    methylation
  67. genes located outside the nucleus in organelles in the cytoplasm
    • extranuclear genes
    • cytoplasmic genes
  68. __ involves silencing of certain genes; phenotype affected by which parent passes the mutant allele;
    genomic imprinting
  69. different X's being activated
    mosaicism
  70. inactivated X chromosome
    Barr body
  71. percentage of recombinant offspring; is related to the distance between linked genes
    recombination frequency
  72. __ of chromosome structure is what results in deletion, duplication, inversion, translocation, aneuploidy, polyploidy, etc.
    alteration
  73. a set of traits
    syndrome
  74. Describes an individual who has only one member of a chromosome pair or chromosome segment rather than the usual two; refers in particular to X-linked genes in males who under usual circumstances have only one X chromosome
    hemizygous
  75. due to alleles assumed to have originated as changes, or mutations
    mutant phenotype
  76. a chromosomal aberration in which one or more chromosomes are present in extra copies or are deficient in number
    aneuploidy

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