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Discussion

A karyotype is

  • A.the complete sequence of an organism's genome
  • B.the pattern of genes expressed within a cell
  • C.the total number of nucleosomes in a nucleus
  • D.the full set of chromosomes displayed in order

Answer: D

Chromosomes are arrested at metaphase, stained and arranged by size and banding pattern. Large-scale abnormalities such as an extra chromosome are visible at once. Down syndrome is diagnosed this way from an extra copy of chromosome 21.

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