genetics chapter 6 exam 2

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kjel
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309005
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genetics chapter 6 exam 2
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2015-10-05 15:12:02
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genetics chapter 6 genetics chapter 6 exam 2
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  1. aneuploidy
    types
    • variation in chromosome number when an organism gains or loses one or more chromosomes but not a complete set 
    • monosomy: the loss of a single chromosome from an otherwise diploid genome
    • trisomy: the gain of one chromosome
  2. euploidy
    • complete haploid sets of chromosomes are present
    • polyploidy: more than two sets are present [triploid=3, tetraploid=4, etc]
  3. nondisjunction
    chromosomes or chromatids fail to disjoin and move to opposite poles during meiosis I or II--> fertilization of abnormal gametes leads to zygotes with three members (trisomy) or only one member (monosomy)
  4. autoployploidy
    the addition of one or more sets of chromosomes identical to the haploid compliment of the same species
  5. allopolyploidy
    the combination of chromosome sets from different species as a consequence of interspecific matings
  6. when do tetraploids arise?
    when chromosomes have replicated and the parent cell fails to divide an d instead enters interphase-- the chromosome number will have duplicated
  7. deletion (or a deficiency)
    when a chromosome breaks in one or more places and a portion of it is lost, the missing piece referred to as a deletion
  8. The deletion can occur near one end, ________, or from the interior of the chromosome, ___________.
    The deletion can occur near one end, terminal deletion, or from the interior of the chromosome, intercalary deletion.

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