8 (11).ppt - Unit C Meiosis Square Dance Homologous chromosomes separate in Meiosis I Sister chromatids separate in Meiosis II Is the failure of

8 (11).ppt - Unit C Meiosis Square Dance Homologous...

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Unit C
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Meiosis Square Dance
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Homologous chromosomes separate in Meiosis I Sister chromatids separate in Meiosis II
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Is the failure of homologous chromosomes to separate in anaphase I or sister chromatids in anaphase II
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It can involve autosomes or sex chromosomes
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It can involve all the chromosomes causing: A. Monoploidy B. Polyploidy This is lethal in most animals It is tolerated by plants (plays a role in speciation) Diploid Number 2n = 32 Polyploidy 4n = 64
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It can involve 1 chromosome causing: C. monosomy D. trisomy
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It always causes the gametes to not have the correct # of chromosomes
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all cells in the future organism will have the wrong number of chromosomes.
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An individual has haploid body cells Missing 1 full set of chromosomes It seen in fungi, male ants, bees and wasps
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It is rarely seen in diploid organisms because if the presence of recessive lethal mutations It is used in plant breeding experiments (useful for the production of mutants)
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Has extra complete sets of chromosomes in all body cells E.g. triploid(3n) tetraploid (4n) = 4 sets It is caused by the spindles breaking Arises from a diploid gamete Polyploids are larger plants
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  • Winter '17
  • John Travis
  • pH, Turner syndrome

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