Came across this nice little paper today:
They demonstrated that different human haplogroups display quite a bit of variation in Y chromosome mutation rates, the extremes being ~75% and ~140% of the overall mean. These correlate with phylogenetic branch lengths, differences in which have been long-recognised, suggesting that this mutation rate variation is the primary cause of this branch length heterogeneity. Not too surprising, but I thought it might interest some people here.
I notice that the correlation isn’t all that great and doesn’t appear to be linear. Any discussion of that?
There are of course other factors that influence branch lengths, so we wouldn’t expect a perfect correlation. Not sure about the non-linearity.
I’d say that it’s hard to say whether it does or doesn’t appear to be linear because the correlation isn’t all that great. 
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