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Message: <blockquote data-quote="El Correcto" data-source="post: 5627965" data-attributes="member: 60631">The reason for this similarity yet at the same time so much diversity is the numbers involved in this. That .1% contains a very large amount of genes that have mutated or other wise not perfect copies of the genes passed to the child, this is known as genetic variations and is a driving force of evolution.X and Y chromosomes are not a monolith, they are also susceptible to mutations and are not a 100% similar to even the parents of the child, even the Y chromosome passed directly from father to son. When you are discussing the Y and X chromosome of another human, yes they play a similar role in determining sex as your but they are not the exact same as yours.</blockquote>