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7/17/2025, 9:18:06 AM
>Note that according to our paper, in the Swat Valley, Steppe ancestry mixes into South Asia in a sex-biased way but in the REVERSE pattern, that is, most of the Steppe ancestry is coming from females
>"In the Late Bronze Age and Iron Age individuals of the Swat Valley, we detect a significantly lower proportion of Steppe admixture on the Y chromosome (only 5% of the 44 Y chromosomes of the R1a-Z93 subtype that occurs at 100% frequency in the Central_Steppe_MLBA males) compared with ~20% on the autosomes (Z = −3.9 for a deficiency from males under the simplifying assumption that all the Y chromosomes are unrelated to each other since admixture and thus are statistically independent), documenting how Steppe ancestry was incorporated into these groups largely through females (Fig. 4). However, sex bias varied in different parts of South Asia, as in present-day South Asians we observe a reverse pattern of excess Central_Steppe_MLBA–related ancestry on the Y chromosome compared with the autosomes (Z = 2.7 for an excess from males).”
>These differences could be explained by a non-sex-biased migration from Central Asia into South Asia of people carrying Steppe ancestry, followed (at some point later) by preferential incorporation of females from this population into the Swat Valley peoples, and preferential incorporation of males from this population into the ancestors of most present-day South Asians
>"In the Late Bronze Age and Iron Age individuals of the Swat Valley, we detect a significantly lower proportion of Steppe admixture on the Y chromosome (only 5% of the 44 Y chromosomes of the R1a-Z93 subtype that occurs at 100% frequency in the Central_Steppe_MLBA males) compared with ~20% on the autosomes (Z = −3.9 for a deficiency from males under the simplifying assumption that all the Y chromosomes are unrelated to each other since admixture and thus are statistically independent), documenting how Steppe ancestry was incorporated into these groups largely through females (Fig. 4). However, sex bias varied in different parts of South Asia, as in present-day South Asians we observe a reverse pattern of excess Central_Steppe_MLBA–related ancestry on the Y chromosome compared with the autosomes (Z = 2.7 for an excess from males).”
>These differences could be explained by a non-sex-biased migration from Central Asia into South Asia of people carrying Steppe ancestry, followed (at some point later) by preferential incorporation of females from this population into the Swat Valley peoples, and preferential incorporation of males from this population into the ancestors of most present-day South Asians
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