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- Haplogroup D-M55 (M64.1/Page44.1) also known as Haplogroup D1a2a is a Y-chromosome haplogroup. It is one of two branches of Haplogroup D1a. The other is D1a1, which is found with high frequency in Tibetans and other Tibeto-Burmese populations and geographical close groups. D is also distributed with low to medium frequency in Central Asia, East Asia, and Mainland Southeast Asia. Haplogroup D-M55 is found in about 33% of present-day Japanese males. It has been found in fourteen of a sample of sixteen or 87.5% of a sample of Ainu males in one study published in 2004 and in three of a sample of four or 75% of a sample of Ainu males in another study published in 2005 in which some individuals from the 2004 study may have been retested. It is currently the most common Y-DNA haplogroup in Japan if O1-F265 and O2-M122 (TMRCA approx. 30,000 ~ 35,000 ybp) are considered as separate haplogroups. It is considered that Haplogroup D-M55 was born in Japan 38,000-37,000 years before present. In 2017 it was confirmed that the Japanese branch of haplogroup D-M55 is distinct and isolated from other D-branches since more than 53,000 years ago. The split in D1a probably happened near the Tibetan Plateau. (en)
- ハプログループD-M55 (Y染色体)（ハプログループD-M55 (Yせんしょくたい)、英: Haplogroup D-M55 (Y chromosome)）とは、分子人類学で用いられる、人類のY染色体ハプログループ（単倍群）の分類のうち、ハプログループDのサブクレード（細分岐）の一つで、「M55」の子孫の系統である。3.5-4万年ほど前に日本列島で誕生したと考えられ、現在日本人の3割ないし4割がこのハプログループに属している。 ISOGGでの名称
* 2006年 ハプログループD2
* 2014年5月 ハプログループD1b (D1,D2,D3->D1a,D1b,D1c)
* 2019年6月 ハプログループD1a2 (D1a,D1c->D1a1a,D1a1b D1b->D1a2)
* 2020年4月 ハプログループD1a2a (D1a2,D1a3->D1a2a,D1a2b) (ja)
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- M55, M57, M64.1, M179, P37.1, P41.1, P190, 12f2b (en)
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- 35000 (xsd:integer)
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- possibly Japanese archipelago (en)
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- ハプログループD-M55 (Y染色体)（ハプログループD-M55 (Yせんしょくたい)、英: Haplogroup D-M55 (Y chromosome)）とは、分子人類学で用いられる、人類のY染色体ハプログループ（単倍群）の分類のうち、ハプログループDのサブクレード（細分岐）の一つで、「M55」の子孫の系統である。3.5-4万年ほど前に日本列島で誕生したと考えられ、現在日本人の3割ないし4割がこのハプログループに属している。 ISOGGでの名称
* 2006年 ハプログループD2
* 2014年5月 ハプログループD1b (D1,D2,D3->D1a,D1b,D1c)
* 2019年6月 ハプログループD1a2 (D1a,D1c->D1a1a,D1a1b D1b->D1a2)
* 2020年4月 ハプログループD1a2a (D1a2,D1a3->D1a2a,D1a2b) (ja)
- Haplogroup D-M55 (M64.1/Page44.1) also known as Haplogroup D1a2a is a Y-chromosome haplogroup. It is one of two branches of Haplogroup D1a. The other is D1a1, which is found with high frequency in Tibetans and other Tibeto-Burmese populations and geographical close groups. D is also distributed with low to medium frequency in Central Asia, East Asia, and Mainland Southeast Asia. In 2017 it was confirmed that the Japanese branch of haplogroup D-M55 is distinct and isolated from other D-branches since more than 53,000 years ago. The split in D1a probably happened near the Tibetan Plateau. (en)
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- Haplogroup D-M55 (en)
- ハプログループD1a2a (Y染色体) (ja)
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