Present-day Iranian Zoroastrians ceased intermixing with other groups shortly after the Arab conquest of Persia during 633–654 CE, and band closely to Indian Parsis, both having a predominant ancestry traced back to what is called the Neolithic Old Iranian Farmer. With two single-generation admixture pulses noted - one predominantly male and Cypriot/Greek from around the time of Alexander's invasion, the other predominantly female and Indian during the first landings in India ( approx. 44 generations ago).
Both groups diverge very distinctively from the rest of the present-day surrounding populations and is to be expected due to strictly enforced endogamy.
No admixture was noted in the priests of either group, of strict patrilineal ancestry, that in the case of Parsis is traced back to 2 male priests.
Present day Iranians have had AT LEAST three major genetic admixture pulses over the last millennium since we separated. And I refer specifically to non-Jewish Muslim Iranians. The majority populace there, who we interact with here.
There was an admixture event with an ancestry contribution related to a Turkish-like source group, dated to 1222 CE (1026–1362 CE), and hence overlapping with the period of the Seljuq Empire (1037–1194 CE) that spanned parts of present-day Turkey.
Then there was another admixture dated to 1418 CE (1194–1558 CE) from a Pakistan-like source that falls into the period of the Timurid Empire (1370–1507 CE) that extended into present-day Pakistan.
Finally, the most recent Iranian admixture event was contributions from an East Africa-like source and an inferred date of 1642 CE (1558–1754 CE) that overlaps with the Safavid Empire (1501–1736 CE) and could be related to the Arab slave trade.
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