geneticstest3.txt

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geneticstest3.txt
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  1. a chromosome without a centromere
    Acentric
  2. mutation involving the accumulation of one or more nucleotide pairs
    Addition Mutation
  3. enzyme that methylates (adds -CH3 group) adenines before replication, thereby distinguishing old strands from the newly synthesized complementary strands of DNA
    Adenine Methylase
  4. a polyploid individual formed from the union of two separate chromosome sets from two or more different species
    Allopolyploids
  5. this results when a dicentric chromosome is simultaneously dragged to opposite poles at anaphase These chromosomes typically will not be incorporated into either progeny cell
    Anaphase Bridge
  6. “Not euploid,” an individual whose chromosome number differs from the normal chromosome number; generally do not have viable offspring; for example in humans having Down's sydrome (trisomy 21) would be aneuploids
    Aneuploid
  7. An enzyme that removes apurinic sites in DNA so that repair synthesis can replace them with appropriate complementary strands
    AP Endonuclease
  8. A DNA site that has lost a purine residue (lose G or A)
    Apurinic Site
  9. individual with multiple chromosome sets originating from within one species, usually formed from the doubling of a single genome
    Autopolyploids
  10. Type of rearrangement where there is a change in the chromosomal gene order but no removal or duplication of DNA occurs (Inversions and reciprocal translocations)
    Balanced rearrangements
  11. A chemical whose molecular structure mimics that of a DNA base; because of the mimicry, the analog may act as a mutagen
    Base Analog
  12. One of several excision repair pathways In this pathway, subtle base-pair distortions are repaired by creation of apurinic sites followed by repair synthesis
    Base-Excision Repair
  13. subdiscipline of molecular biology interested in predicting the information content of nucleotide sequences
    Bioinformatics
  14. any type of change in the chromosome structure or number; these are large-scale mutations as opposed to gene mutations that are usually point mutations…
    Chromosome mutation
  15. GACT substitution within a codon that leads to replacement of an amino acid with one of similar chemical properties
    Conservative Substitution
  16. A mutation involving the removal of one or more nucleotide pairs OR a larger portion of a chromosome
    Deletion Mutation
  17. A chromosome with two centromeres
    Dicentric
  18. Enzymes that remove altered bases, leaving apurinc sites
    DNA glycosylases
  19. the molecular ATGC differences at a given location that occur between individuals of a species
    DNA polymorphisms
  20. The process in organisms using a chromosomal sex determination mechanism (XX vs XY) that allows standard structural genes on the sex chromosome to be expressed at the same levels in males and females, regardless of the number of sex chromosomes In mammals it operates by maintaining only a single active X chromosome in each cell
    Dosage compensation
  21. An abnormal phenotype including mental retardation, that is due to a trisomy of chromosome 21 caused by a nondisjunction; more common in babies born to older mothers
    Down Syndrome
  22. More than one copy of a particular chromosomal segment in a chromosome set
    Duplication
  23. an individual with the basic number of chromosome sets, for example in humans we would expect 44 autosomes, 2 sex chromosomes for a diploid total of 46
    Euploid
  24. works if only one side of the DNA helix is damaged, the repair of DNA lesion by removal of the faulty DNA segment and its replacement with a wild-type segment using the repair DNA synthesis system
    Excision Repair
  25. The insertion or deletion of a nucleotide pair or pairs, causing a disruption of the translational reading frame
    Frameshift Mutation
  26. The relationship between the number of copies of a gene and the amount of the gene’s product made, i.e. the more copies of the gene, the more transcripts are produced and the more of the corresponding protein is made
    Gene-dosage Effect
  27. study of the gene organization, protein families, biochemical pathways, developmental regulation, gene regulation for ALL expressed transcripts and/or polypeptides of an organism
    Genomics
  28. partially homologous chromosome sets, these are found in allopolyploids
    Homeologous
  29. a shortcut to say both insertion and deletion mutations
    Indel Mutation
  30. a mutation that occurs after mutagen (environmental agent) treatment
    Induced Mutation
  31. A mutagen that can insert itself between the stacked bases at the center of the DNA double helix, causing an elevated rate of indel mutations
    Intercalating Agent
  32. A small deletion WITHIN a gene
    Intragenic deletion
  33. The paired homologs in inversion heterozygotes form a loop because one chromosome twists once at the ends of the inversion to pair with the untwisted chromosome
    Inversion loop
  34. A chromosomal mutation consisting of the removal of a chromosome segment, its rotation through degrees, and its reinsertion in the same location (Reversing the segment)
    Inversion
  35. Combination of XXY chromosomes (extra X chromosome) These persons are males with lanky build, with some developmental abnormalities, and usually are sterile
    Klinefelter syndrome
  36. A large set of cloned DNA molecules spotted onto a solid matrix (such as a microscope slide) for use in probing a biological sample for example, to monitor gene expression
    Microarray
  37. variable numbers of dinucleotides repeated in tandem, most common is CA on one strand and GT on the complementary strand
    Microsatellite
  38. based on units of 15-100 bases repeated to lengths of 1000-5000 base pairs long scattered throughout the human genome
    Minisatellite
  39. A repair system for repairing damage to DNA that has already been replicated
    Mismatch-Repair
  40. general term for nucleotide substitution within a protein-coding region that changes the codon to specify another amino acid
    Missense Mutation
  41. An individual of a normally diploid species that has only one chromosome set (n) Examples include male bees, wasps, and ants
    Monoploid
  42. (monosomic, 2n-1 in diploids) a cell or individual that is basically diploid but that has only one copy of one particular chromosome type, for example Turner's syndrome is monosomy X (XO)
    Monosomy
  43. larger deletions in a chromosome across more than one genetic locus with more severe consequences than intragenic deletions
    Multigenic Deletions
  44. an environmental agent which increases the mutation rate, examples include viruses, UV light, radiation, X rays, some chemicals!
    Mutagen
  45. as simple as the change of one base pair from what was expected, can include small or large scale additions, deletions or rearrangements of chromosomes
    Mutation
  46. variation in DNA sequences, those GATC's, from one individual of a species to another, usually in the wobble position. Current estimates show 1 variation every 1000 base pairs in human individuals, so just 3 million base changes separates you from your neighbor!
    Neutral DNA sequence variation
  47. GACT substitution in a codon that leads to replacement of an amino acid with one of different chemical properties
    Nonconservative Substitution
  48. The failure of homologs (at meiosis) or sister chromatids (at mitosis) to separate properly to opposite poles
    Nondisjunction
  49. GACT substitution within a protein-coding region that changes a codon for an amino acid into a termination codon
    Nonsense Mutation
  50. An excision-repair pathway that breaks the phosphodiester bonds on either side of the damaged base, removing that base and several on either side, this is followed by repair DNA synthesis to fill in the gap
    Nucleotide Excision-Repair System
  51. (nullisomy, 2n-2 in diploids) a cell or individual with one chromosomal type missing, there are no examples of diseases in humans with a total loss of both homologous chromosomes!
    Nullisomic
  52. one origin of spontaneous DNA damage due to reactive oxygen chemicals like hydrogen peroxide, yields a high level of G to T transversions
    Oxidatively Damaged Base
  53. a type of inversion where the centromere is outside of the inversion
    Paracentric
  54. the production of offspring by a female with no genetic contribution from the male, the unfertilized egg can develop into an embryo without being fertilized (found in male bees, wasps and ants!)
    Parthenogenesis
  55. a type of inversion that spans the centromere
    Pericentric
  56. an enzyme that cleaves thymine dimers
    Photolyase
  57. a complete series of clones that are sequenced to generate the entire sequence of GATC's for all or part of a chromosome (telomere to telomere!)
    Physical map
  58. mutation that can be mapped to one specific locus
    Point Mutation
  59. these are ABERRANT EUPLOID individual organisms in which there are more than two chromosome sets, triploid (3n), tetraploid (4n), etc. Especially found in plants that are VIABLE and produce viable offspring!
    Polyploids
  60. the sudden appearance of a recessive due to deletion of a masking dominant gene
    Pseudodominance
  61. apparent linkage of genes that are normally on separate nonhomologous chromosomes A diagnostic clue to the presence of a translocation
    Psuedolinkage
  62. randomly amplified polymorphic DNA, using PCR primers with a "random" set of GATC's to amplify several different genome regions
    RAPD
  63. changes in chromosome structure that include changes such as deletion, duplication, inversion, and translocation
    Rearrangements
  64. the repair of a DNA lesion through a process, similar to recombination
    Recombinational Repair
  65. restriction fragment length polymorphism, some individuals will have a site where a restriction enzyme cuts their DNA, other individuals will not have this same site
    RFLP
  66. single nucleotide polymorphisms, usually due to neutral variation in the wobble position, the individual GATC differences in two genomes between two individual of the same species
    SNP’s
  67. an emergency response and error-prone process whereby gross structural DNA damage is bypassed by inserting nonspecific bases using some of the DNA replication enzymes
    SOS Repair System
  68. a mutation occurring WITHOUT exposure to mutagens, also known as the background rate of mutation usually due to errors of DNA duplication
    Spontaneous Mutation
  69. simple sequence length polymorphisms, or variation in short repeats that has replaced RFLP for DNA fingerprinting since most genomes have more variation in SSLP than RFLP markers
    SSLP
  70. GATC substitition in a codon that does not change the amino acid brought to the ribosome, also called silent mutaitons or neutral variation
    Synonymous Substitution
  71. description of DNA segments in which the gene order is identical in different related species
    Syntenic
  72. the spontaneous isomerization of a nitrogen base from its normal keto form an alternative hydrogen-bonding enol form
    Tautomeric Shift
  73. a type of nucleotide substitution involving the replacement of a purine with another purine (G to A or A to G) or of a pyrimidine with another pyrimidine (C to T or T to C)
    Transition
  74. the relocation of a chromosomal segment in a different position in the genome
    Translocation
  75. a type of nucleotide substition where a pyridine replaces a purine or the reverse, so C to A or C to G or A to T, etc.
    Transversion
  76. the expansion of a base pair repeat from a relatively low number of copies to a high number of copies that is responsible for a number of genetic disease, such as Huntington’s disease
    Trinucleotide Repeat Disease
  77. (trisomic, 2n+1 in diploids) a cell or individual that is basically a diploid with an extra chromosome of one type, for example Down's syndrome with trisomy 21
    Trisomy
  78. a rearrangement of chromosome parts that changes the gene dosage of a part of the affected chromosome (Deletions and duplications)
    Unbalanced rearrangements
  79. variable number of tandem repeats, in humans a stretch of GATC's from 15-100 base pairs long that are repeated to lengths of 1-5 kb
    VNTR
  80. attempt to understand the organization and base sequences of all the DNA in an organism (for humans this means mapping all 23 chromosomes plus the mitochondria's DNA)
    Whole genome mapping
  81. part of the dosage compensation in mammals where the second X chromosome in a FEMALE mammal is not used for transcription
    X Chromosome inactivation

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