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View Full Version : IV-Alterations of Chromosome Number and Structure


  1. 18- Accidents during meiosis can alter chromosome number
  2. 19- A karyotype is a photographic inventory of an individual’s chromosomes
  3. 20- Connection: An extra copy of chromosome 21 causes down syndrome
  4. 21- Connection: Abnormal numbers of sex chromosomes do not usually affect survival
  5. 22- Evolution Connection: New species can arise from errors in cell division
  6. 23- Connection: Alterations of chromosome structure can cause birth defects and cancer