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An organism has 27 chromosomes. Use a * to represent centromeres, and a $ to represent...

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Biology

An organism has 27 chromosomes. Use a * to representcentromeres, and a $ to represent repetitive regions of DNA causedby transposable elements. Chromosome 4 has the sequence A$BC*$DE,while chromosome 17 has the sequence L$MNO$*PQ.

  1. If chromosome 17 misaligns with itself (without flippingbackward) during meiosis I and undergoes crossing over in therepetitive region, what will be the sequences of chromosome 17 thatresult in each of the four gametes produced by thiscell?

  2. What abnormal chromosome sequences could be created ifchromosome 4 misaligned with itself (without flipping backward)(there should be 2 of these)?

  3. Which of the abnormal sequences would be likely to beleft hanging out in the cytoplasm (where it would likely degrade)without being tugged into either nucleus?

  4. If instead of misaligning with itself, chromosome 4aligned with chromosome 17 (without flipping backward or having anydouble crossover events), provide 6 of these sequences, and labelthe ones that have too many or too few centromeres?

  5. For a Eukaryotic animal cell, is it generally moredeleterious to be triploid or to have trisomy of a singlechromosome? Why is triploidy an impossible long-term state for thegenerations that come after a triploid organism that reproducessexually?












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