Mapping Human History: Discovering the Past Through Our Genes
Mapping Human History
Discovering the Past through Our Genes Mapping Human History follows humans from Africa to Europe , Asia , the Middle East , and the Americans , tracking their movements across continents , exploring regional genetics at every stop . Reconstructing the history of various peoples , the book points out how the historical path of humans constantly overlaps
In the book , Steve Olson makes a very big claim such as Every single one of the billion people on the planet today is descended from the small group of anatomically modern humans who once lived in [banner_entry_middle]
eastern Africa . Africans with high foreheads , sharp chins , and light graceful bodies much like today . But before they are markedly different Certainly people would say they are extraordinary looking human beings They are the so called archaic humans . Today they are gone . Modern humans substitute their ancestors
Olson claims that genetics confirms that human groups are all closely related and acquire only the most external genetic differences . Human DNA passes on genetic information from one age group to the next , bears indentation of human history . It documents the appearance of modern humans . It records the diversifications of modern humans into races and ethnic groups ‘ that we are familiar with today . Due to the human affinity to interbreed and our genus times past of resettlement from continent to continent , everyone is connected to a common band of ancestors . Genetics are beginning to understand the story written in our DNA , They can map out the association of modern humans out of Africa to the rest of the world . They piece together when and how people acquire their distinctive physical appearances . With continual mixing of people physical attributes intermingle . As a result individuals differ from each other . The differences are all between individuals . The genetic variations accountable for our diverse emergences tend to remain localized within groups . Groups keep hold of some measure of physical individuality . History reveals the many ways in which we are genetically linked . Human beings are all related , all different
Olson contends that everyone inherit his or her DNA from the same people , and everyone gets the rest of DNA from the people who lived sometimes in the past yet everyone ‘s DNA is not exactly the same Whenever cell divides it has to copy its DNA so that each daughter cell has a complete set of chromosomes . This process is amazingly accurate The molecular machinery that reproduces DNA can continue for millions of nucleotides without making mistakes . But the process is not perfect Occasionally a mistake occurs . Any mistake in the copying of DNA is known as a mutation . Mutations – created when cells reproduce their DNA – are the key to reconstructing of our genetic history , writes Olson Parents hand down mutation to their children , creating a unique genetic pattern that spreads throughout certain populations . By counting the mutations that differ between two distinct DNA sequences , genetics can find out who is related to whom and estimate the number of generations that passed since a common ancestor… [banner_entry_footer]
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