XX and XY are the chromosome pairs that determine your sex but what happens when you’re born with XXX or XYY? How often does this happen?
Check out Wise Crack for more cool videos like this one: Is Gender Real?
Human Sex Chromosomes Are Sloppy DNA Swappers
“The genetic bundles that code for males and females can get a little messy when they trade pieces during cell division”
Evolution of the Y Chromosome
“The human X and Y chromosomes are a unique pair. The other chromosome pairs, called the autosomes, appear to be identical twins; they are superficially indistinguishable. In contrast, the X and Y chromosomes appear to be vastly different from one another.”
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