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I was able to find the answer to my question. In case anyone else cares- 2n does not necessarily mean that a cell is diploid. The x refers to the ploidy (the n doesn't refer to the ploidy) n is the number of chromosomes in a gamete 2n is merely twice that number (what you end up with when 2 gametes fuse) 3n is three times the haploid number of chromosomes (what you get when 3 gametes fuse). Wheat endosperm has 3n=63 chromosomes (created from the fusion of one sperm cell and two polar bodies).

I'm trying to understand ploidy and something is not making sense to me. can anyone help? wheat (Triticum aestivum) has haploid number n=21 (there are 3 copies of each type of chromosome in the gamete, so the monoploid number, x=7) its somatic cells are described as having 2n=6x=42 chromosomes. (double what is in a gamete or 6 copies of the 7 different chromosomes) This makes perfect sense to me except for the 2n part. I thought that 2n implied that a cell is diploid (i.e. two sets of chromosomes) but the wheat cell has 6 sets of chromosomes. So apparently I don't understand what 2n really means. What would be an example of something that is 6N??