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Molecular clock

Added Sep 21, 2017 •

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in the previous lesson you learned that comparative biochemistry analyzing DNA and protein allows us to determine the relationship that we have between each other we're going to do a biochemical variation molecular differences can be used as an evolutionary clock how long ago two organisms diverged from each other if we were to jump back to 60 million years in Tracy's mutations that a constant rate would be able to determine just how long ago these organisms diverged from each other are there any differences between humans and we can determine that we share a more recent common ancestor with each other then we do the other organisms in this diagram at the rate of mutation occurs at a constant rate over time we can estimate exactly how long ago we diverge from the organism diagram selected DNA sequences that match up with the chimpanzees DNA we can tell that chimpanzees DNA messes up a hundred percent with its own DNA but if we were to analyze our DNA it matches almost 98% to that of chimpanzees DNA match up about 97% of the time to chimpanzees what does it mean this means the chimpanzees and humans are more related to each other they are two gorillas father still a ton of differences between us and other primates that are alive today there's not as many differences between us and red and Homo neanderthal diagram shows a pattern of species that are related to humans in the past come to believe that the human species came out of Africa Europe across Asia cross the Bering Strait into Alaska North America finally down to South America and assuming UVA Credit concentrate by analyzing your DNA determine where your ancestors are from in fact there are some genetic companies who if you pay a small fee tell you how related you are to people all over the world and even more exciting companies claim to have the ability to compare your DNA and your friends DNA to determine related to other play, neanderthal navigate music video complete the following activity to see how DNA analysis can be used as an evolutionary time keeper and how to show common ancestor lady organism

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Molecular clock

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