Polyploidy
This image shows haploid (single), diploid (double), triploid (triple), and tetraploid (quadruple) sets of chromosomes. Triploid and tetraploid chromosomes are examples of polyploidy.
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"Haploid, diploid ,triploid and tetraploid."
http://en.wikipedia.org/wiki/File:Haploid,_diploid_,triploid_and_tetraploid.svg
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