Discussion in 'Biology' started by Thecjgcjg, Nov 27, 2017.
How is DNA evidence used to show evolutionary relationships?
The closer two species are on the evolutionary tree, the more similarities we see in their DNA sequences (aka homology). If we look at just mammals, we see the most homology between humans and apes. There is less sequence homology between us and dogs, for instance, or whales. When you look at other branches of the tree, like amphibians, there is still some homology, but much less, suggesting that our evolutionary lines split off from one another long ago.
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