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Note that the MRCA and his/her ancestors did not pass all their genes down to every person alive today. Because of sexual reproduction , an ancestor only passes "half" of his or her genes on to the next generation. (Technically, it is half of those genes in which the parents differ . All members of a species are genetically very similar; even fruit flies share about half of their genes with humans,  and so both parents share the vast majority of their genetic material, and so most of their genes are passed on to their offspring.) The percentage of genes inherited from the MRCA becomes smaller and smaller at every successive generation, as genes inherited from contemporaries of MRCA are interchanged via sexual reproduction. 
This 19th-century view is not wholly dead, albeit that it stands in stark contrast to the ideas of neo-Darwinism . In modern psychology, genetic memory is generally considered a false idea. However, biologists such as Stuart A. Newman and Gerd B. Müller have contributed to the idea in the 21st century. 
They also want to explore whether similar effects can be seen in the genes of humans.
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