Ahhh, interesting yes. I see what you mean now.
It looks as though that seems to be the case, if the female offspring are displaying more of the traits of the original female population (native) and the male offspring are displaying more of the traits of the original male population (indo-european). As to the genetic reason, i'm not sure as to why this would happen, but i'm sure they're trying to find reasons why. It maybe unique to this group specifically, but generally it's not the rule. The only rule i can think of is the correllation between mtDNA U and blondism in european women. So girls typically will inherit blondness from a mtDNA hg U mother, even if the father is dark haired. I suppose inbreeding is one hypothesis, but you're right, this happened in many ancient peoples.
we can (hypothetically) say that the entire South Asian brown skinned dark haired people are the result of miscegenation between Caucasoid Y Chromosomes and Mongoloid mtDNAs. May be a little bit of Negroid mtDNAs played a role there. this may explain why misogyny is ingrained in the society. its really very interesting...