One cell divides into two cells.  These cells divide incorrectly, creating two gametes with one chromosome, one gamete with two chromosomes, and one gamete with no chromosomes.  These cells are fertilized to produce two cells with two chromosomes, one cell with three, and one with one chromosome.

Image source: By Tweety207 (Own work) CC BY 2.0, via Wikimedia Commons

Which of the following describes the figure above?

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