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Question: Did the mutations that define haplogroups R1a and R1b both happen at the same time? In other words, do R1a and R1b necessarily have the same age? I asked this question before in the R1a group, but no one seems to have a good answer. I ask because every age estimate I have seen gives...

Question: Did the mutations that define haplogroup R1a and R1b both happen at the same time? In other words, do R1a and R1b necessarily have the same age? I ask because every age estimate I have seen gives the same age for both (e.g. 22,800 YA). But couldn't R1b have split off first, and the...