SimonSays97
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As far as I understand, haplogroups are formed by common mutations on the Y chromosome. When an ancestor has a mutation and passes it on to his sons. What I am wondering is why today there are only R1a, R1b and R2? The ancestor who had the mutation for haplogroup R would not have had just one son? So logically there should be many more haplogroups of R than just the three mentioned? There should also be other lines of haplogroup R. Even if all the other male descendants of the first person with R did not have any mutations, should we still be able to find other descendants of haplogroup R today? There were many intermediate stages between haplogroup R and R1a, R1b and R2. How is it possible that all these intermediate stages have been “lost” and only these 3 have survived? So it is completely unrealistic that all other lineages have become extinct? I hope you understand what I mean. Can someone explain this to me?