Y chromosome ancestry, Michael Hammer
Interviewee: Michael Hammer. Evolutionary geneticist Michael Hammer talks about tracing modern Y chromosomes back to a common ancestor. (DNAi Location: Applications > Human origins > Gene genealogy >The Y chromosome > Y chromosome ancestry)
Our work has shown, as has others, that the Y chromosome diversity we see in men today traces back to a single man who lived probably in Africa. And when I say a single man, we have to be cautious in how we interpret that. There were many men living at the time, but because of the way the Y chromosome is inherited, as you trace it back in time it has to trace to a single common ancestor. Just as a boy's Y chromosome today traces to his dad, his grandfather, his great-grandfather; it's not tracing to his other grandfathers and great-grandfathers and grandmothers, obviously because they don't have a Y chromosome. But the grandfathers who didn't bear the son didn't transmit their Y chromosome to the next generation. So, it has to ultimately trace back to a single man. One of many men living in the population at the time.
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Evolutionary geneticist Michael Hammer talks about the limitations of Y-chromosome research and the histories of different genes.
Geneticist Michael Hammer speaks about Y-chromosome studies used to correlate a population's tradition with its genetics.
Evolutionary geneticist Michael Hammer speaks about the markers used to analyze DNA variation in the Y chromosome.
Geneticist Jaume Bertranpetit speaks about the findings from Y-chromosome and mtDNA studies.
Evolutionary geneticist Michael Hammer speaks about methods of measuring a population's age by the mutations in its individuals.
A pedigree illustrating maternal inheritance of mtDNA and paternal inheritance of the Y chromosome.
Author Steve Olson talks about the possibilities for new genetic data about the history of human populations.
Evolutionary geneticist Michael Hammer speaks about the reliance of genetic research on fields such as archeology for reliable time estimates.
Geneticist Stephen Oppenheimer talks about the mitochondrial DNA and Y chromosome lineages of our ancestors.
Geneticist Mark Stoneking, one of the authors of a controversial 1987 paper on mtDNA, talks about our common female ancestor.