Now, depending on how quick evolution can act, the fact that the 1⁄30 of the selection influence is the most recent1⁄30 could be crucial.
This is an important insight, if that’s the reason behind the question. If you break one’s genetic heritage into 30 equal slices, 29 of which are hunter-gatherer, one of which is farming, and the last fragment is a rounding error too short for evolution to matter. You’ll likely find that evolution is punctuated by reactions to large changes in what makes for fitness in the environment. The first slice (change from little cooperation and very low cultural adaptations to cooperative hunter-gatherer tribes with some amount of cultural knowledge transfer) likely saw a fair bit of change. The second through 29th slices saw continued adaptation to previous adaptations, but no major disruptions at the evolutionary/genetic level. The 30th slice saw a huge environmental change, and a somewhat different selection pressure.
The most recent 1⁄30 could EASILY have more impact than the 28 10000-year segments before it.
This is an important insight, if that’s the reason behind the question. If you break one’s genetic heritage into 30 equal slices, 29 of which are hunter-gatherer, one of which is farming, and the last fragment is a rounding error too short for evolution to matter. You’ll likely find that evolution is punctuated by reactions to large changes in what makes for fitness in the environment. The first slice (change from little cooperation and very low cultural adaptations to cooperative hunter-gatherer tribes with some amount of cultural knowledge transfer) likely saw a fair bit of change. The second through 29th slices saw continued adaptation to previous adaptations, but no major disruptions at the evolutionary/genetic level. The 30th slice saw a huge environmental change, and a somewhat different selection pressure.
The most recent 1⁄30 could EASILY have more impact than the 28 10000-year segments before it.