Ethnically the population of India is supposed to be a mixture of ANI (Ancient North Indians) and ASI (Ancient South Indians). The ASI is a mixture of hunter-gatherers native to the Peninsula and the agriculturists from Mediterranean region and Iran called Iranian farmers. The ANI is a mixture of migrants from Central Asia and the Iranian farmers. There were also some Mongoloid migrants from the Northeast. There were no trace of Negroids or Australoids in the native population but it was totally native which might be termed Dravidian, though 'Dravidian' is a linguistic term and not an ethnic term. The so called 'Aryan Invasion Theory' is a myth and there was not any invasion but only migrations from Central and West Asia. Today all the Indians carry the traces of ANI and ASI genes in varying degrees. The South Indians have predominantly more ASI genes and the North Indians more ANI genes. The Indus Valley Civilization was created by people with ASI genes and if it had not collapsed due to change of climatic conditions like droughts that lasted for centuries, and if the IVC people had spread across the rest of the subcontinent, the population would have been more homogeneous.
Well,well,well. Some amount of corrections.
AASI is an another phenotype that existed then. They are said the first inhabitants who we can see through the genes. They are said to be closer to Andamanese as per Scientists. This phenotype is today extinct totally in the mainland. Their language hasn't yet been traced though there are a couple of language isolates in Central India today other than Dravidian and surrounded by an Indo-Aryan language ocean. It's a tribal language and even those speakers aren't the pure AASI phenotype.
Now coming to the ASI,IVC is first theorized to have been found by an Iranian and Anatolian(not the Indo-European Anatolians) migrations who took agriculture from its starting point in Çatalhuyuk in Southern Turkey of today. They would have been diverse in origin. IVC was joined in waves and waves of others in its tenure as it seems. No ASI yet. ASI started appearing in the waning days of the IVC as it appears as these mixed with the hunter gatherers of the AASI phenotype. There could have also been widespread epidemics that could have affected the not so diverse AASI brought from elsewhere in ME,Central Asia,Iran to which the natives would have less immunity to. But these are still projections. Now an another interesting point. It is theorized there was an already another Nordic Race which is the source of haplogroup L that originated in the Pamir. It is theorized that these spread out settling here and there,put the Nordic Tarim Mummies that probably predates Tocharians(often confused as Tocharians were also White but more towards Celtic type),established the BMAC and also in some number came to the IVC and joined,possibly the source of Gutians,an another Nordic Race in the ME who ruled the Sumerian empire for a time. The Burusho are the surviving members of this race today probably. They are Nordic type even now and speak a language Isolate and live in valleys of Kashmir on both sides of the LOC. Now,this L Nordic type was not associated with a language family like the Proto-Indo-Europeans. They are also hypothesized to be the source of Proto-Dravidian language in India. No proofs yet for this. Indo-Aryans are still on their way. Indo-Aryans were first heard of at the BMAC region. They settled the Afghanistan region in large numbers forming the different confederations as mentioned in the Rig Veda. The early Nordics were assimilated by the Indo-Aryans. The region called Gandhara(Afghanistan to Kashmir and also the region where these people of this thread live today) was the first to be settled by them. IVC had collapsed by now and ASI formed by the mixing of native AASI hunter gatherers,IVC people and some Nordic L type. ANI formed by the mixing of Indo-Aryans,Nordic L in small numbers,Indus valley farmers. You know the later events. It wasn't an invasion but rather a migration as you said.
In the mountain regions,the Indo-Aryans and the Nordic L type mix survives as the Burusho,Kalash,Pashayi,Chitrali,Hunza,etc who retain the features of their original ancestral races intact today. Except Burusho,all Indo-Aryan speakers and probably descendents of Gandharvas and Dardas as said in Vedic Sanskrit. The thread is about them being more numerous.
Yaghnobi are a mix of Eastern Iranian and the Nordic L type. Though close genetically,the contact didn't exist and these are Iranian speakers and not Indo-Aryan speaking.
I am looking to reconstruct the Gandhara language and finding resources for it.
Cc:
@Freedom2018