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Question: What kind of event would cause the current Mitochondrial Eve to be replaced by a new one?

Explain your answer in detail.

And the values in Wikipedia about Mitochondrial Eve and Y-chromosomal Adam and I am not sure I understand the concept behind them.When talking about a maternal unbroken linage and a paternal unbroken linage, is the meaning that Mitochondrial Eve had a linage of only women reaching every person today, and the same with Y-chromosomal Adam and men? So that other humans that lived in their age, didn't have an unbroken line of linage consisting of only same sex descendants?

How is the specific "identity" or time period of those persons is known, assuming that researchers didn't check the Mitochondrial DNA or Y-chromosome of every single living human being today, how can they know for sure that there aren't some tribes in the Amazons, which have a direct female linage to Mitochondrial Eve's sister?

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Category:- Biology
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