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Thanks Becky that is useful.
But does that argument equally always apply to a "single" gene as against the whole genome. Can a population in the main have just have one version of a single gene which would mean for most it was a PP and PP situation.
I have no idea. Just asking?
Also whilst on the subject how frequent are inherited genetic mutations in very general terms?
And where mutations are spotted in those with cancer how do you know if the mutation is inherited or the result of the cancer - and how do they know which is which?
So many questions!
Many thanks
RB
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