Really sorry again 420noobie but that is not a cannabis plant - regardless of what your friend and you think.
Look at how the leaves are setup... So cannabis has palmately compound leaves; that is to say that each leaf is comprised of 3-13 individual leaflets which are connected to a central point.
Both same type of leaf.
So cannabis can vary in several ways. Some strains have thick leaflets (indica dominant), some have thinner leaflets (sativa dominant), some have fewer leaflets like duckfoot and maple leaf, but they are still all the same type of leaf.
What you have pictured is a plant without compound leaves... Yes, they are palmately lobed, but they are not compound. That is NOT cannabis. Sorry.
Palmately lobed (not the same as cannabis)
And no, that is not a mutation that can occur in a single generation.