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Evidence for relationships between organisms
When one species gives rise to another the DNA will be similar but
mutations in the bases will cause it to change
A way to determine similarities between species is to use DNA
Depends on particular property of DNA helix
Double helix splits when…

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Phylogenetic tree developed bases upon DNA sequences
The tree showed how species have developed into grouped
Sequence of amino acids in proteins is determined by DNA
the more similarly amino acids are of same proteins reflects how closely
related species are
two sequences are compared
counting number of similarities or…


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