The laws of chance tell us that two random sequences from species that have no ancestry in common will match at about one in every four sites.

Name: The laws of chance tell us that two random sequences from species that have no ancestry in common will match at about one in every four sites.
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This is because there are four possible nucleotides (A, T, C, G) at each site, so the probability of a match by chance is 1 in 4, assuming equal distribution and no common ancestry.

The Laws of Chance Tell Us That Two Random Sequences