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mtDNA · 母亲 lineage

B2A5

mtDNA Haplogroup B2A5

探索家族关系 浏览样本

一个家族分支的参考简介 。 共享haplogroups 无法建立家庭关系或文化认同 。

参考简介

部门背景

mtDNA 谱系分支 B2A5 的历史背景

Origins and Evolution

B2A5 is a downstream branch of mtDNA haplogroup B2A, itself a daughter clade of Native American haplogroup B2. B2A diversified within the Americas after the initial peopling events that derived from Beringia during the terminal Pleistocene and early Holocene. Based on its placement as a terminal subclade of B2A and its relative rarity compared with more basal B2 lineages, B2A5 most plausibly arose in the Late Holocene (several thousand years ago) as a regional maternal lineage that expanded locally within parts of South and Central America.

Phylogenetically, B2A5 carries the defining mutations that characterize the B2A branch plus one or more private mutations that distinguish it from sibling subclades (B2A1–B2A4, etc.). The limited number of reported samples and the subclade's presence in a modest number of ancient and modern sequences indicate a moderately recent founder event or local differentiation from a B2A maternal ancestor.

Subclades

As a specific terminal clade, B2A5 may have minimal or no widely recognized named downstream subclades in currently published phylogenies; additional fine-scale structure could emerge with denser complete mitogenome sampling. When present, substructure within B2A5 is expected to reflect micro‑regional diversification (for example, river basin or highland vs lowland splits) consistent with demographic patterns seen in other Native American maternal lineages.

Geographical Distribution

B2A5 shows a concentration in South America, especially among indigenous groups of the Amazon basin and certain Andean populations, with lower-frequency occurrences in parts of Central America and occasional detections in pre-contact and historic samples from the Caribbean and coastal regions. Sparse occurrences in northern North America or among admixed modern populations reflect either rare long-distance movement, post-contact migration, or low-level retention from pre-contact distributions. Ancient DNA hits attributed to B2A-related lineages indicate the clade has an archaeological presence in multiple early- to mid-Holocene contexts across the Americas, although B2A5 itself is better represented in later Holocene contexts.

Historical and Cultural Significance

Because B2A5 is a regional derivative of the widespread Native American B2 clade, its significance lies in reconstructing local maternal histories rather than continent-wide migrations. The distribution of B2A5 can inform questions about population continuity, micro‑regional expansions (for example, demographic pulses associated with late-Holocene cultural transitions), and maternal gene flow between lowland and highland ecological zones. In combination with archaeological and linguistic data, B2A5 occurrences can help identify maternal line continuity in preceramic to formative era contexts and trace more recent pre-contact population structure.

Conclusion

B2A5 is a locally differentiated mtDNA lineage nested within the Native American B2A clade. It likely originated within South or Central America in the late Holocene and today serves as a marker of regional maternal ancestry in Amazonian, Andean, and some Central American indigenous populations. Broader mitogenome sampling and additional ancient DNA recovery will refine its age estimate, internal substructure, and detailed geographic history.

关键点

  • Origins and Evolution
  • Subclades
  • Geographical Distribution
  • Historical and Cultural Significance
  • Conclusion
参考简介

树形关系( N)

phylgenetic 上下文和子拼写

进化路径

沿已记录的上级分支追溯至 B2A5。年代为估计值，可能随参考数据更新而调整。

步骤 单倍群 年龄估计 考古时代 时间流逝 直系后裔 被测试的现代后裔 古代连接
1 B2A5 当前 ~4,000 years ago Bronze Age 4,500 years 0 0 0
2 B2A ~12,000 years ago Neolithic 12,000 years 6 14 19
3 B2 ~15,000 years ago Mesolithic 15,000 years 21 946 4
4 B4B ~15,000 years ago Mesolithic 15,000 years 3 972 0
5 B4B'D'E'J - - - 3 997 0
6 B4 ~28,000 years ago Paleolithic 28,000 years 4 1,122 7
7 B4'5 ~40,000 years ago Paleolithic 40,000 years 2 1,432 0
8 RA - - - 3 1,452 0
9 R ~55,000 years ago Paleolithic 55,000 years 17 22,830 57
10 NA - - - 1 22,830 0
11 N ~60,000 years ago Paleolithic 60,000 years 16 26,150 13
12 L3 ~70,000 years ago Paleolithic 70,000 years 7 30,162 6
13 L3'4 - - - 2 30,212 0
14 L3'4'6 - - - 2 30,216 0
15 L2'3'4'6 - - - 2 31,333 0
16 L2'3'4'5'6'7 - - - 2 31,349 0
17 L1'2'3'4'5'6'7 - - - 2 31,852 0
18 L ~160,000 years ago Paleolithic 160,000 years 2 32,236 5

Subclades (0)

终端分支 -没有记录的子密钥

Siblings (5)

来自同一父分支的分支( oplogroup)

B2A* B2A1 B2A2 B2A4 B2W
参考简介

哪里是这个世界

地理分布和现代存在

记录来源

Central / South America (Beringia-derived)

现代发行

The populations where mtDNA haplogroup B2A5 is found include:

  1. Indigenous peoples of South America (especially Amazonian and select Andean groups)
  2. Indigenous populations of Central America and southern Mexico (localized occurrences)
  3. Indigenous North American groups (low frequency, localized occurrences)
  4. Pre-contact coastal and island populations of the Caribbean and Pacific (regional occurrences)
  5. Admixed populations in the Americas affected by historic movements (low frequency)
  6. Samples from ancient DNA studies in mid- to late-Holocene contexts across the Americas
历史背景

分枝穿越时间

大致历史时间范围内的估计形成情况:周期标志提供了背景,并不意味着与特定文化的联系。

  1. ~10k 年前

    新石器革命

    农业开始,定居社区形成

  2. ~5k 年前

    青铜时代

    金属加工、书写和早期文明

  3. ~4.5k 年前

    Haplogroup B2A5

    此 mtDNA 分支的形成时间为推定值，日期和地点仅作参考。

    这个分支
  4. ~3k 年前

    铁器时代

    铁工具,扩大贸易网络

  5. ~2.5k 年前

    古典时代

    希腊和罗马文明蓬勃发展

  6. 现

    现日

    现代时代

参考简介

考古学背景

已记录的 mtDNA 分支 B2A5 考古关联

有记录的协会

这些标签描述与 B2A5 相关的参考样本所处的考古背景。仅凭这种关联，无法判断所有携带者都属于某种文化或沿同一路线迁徙。

Island Chumash La Jolla Tayopa
文化任务基于古代DNA样本的考古背景,可能代表特定时期的区域协会.
参考简介

样本目录

单倍群 B2A5 的直接携带者 14 名

10 显示 ^ 14 匹配样本

Portraits是AI生成的插图,样本标签和加入ID识别参考记录.

纵向 样本 国家 大纪元 日期 文化 mtDNA 匹配
AI生成的示例性肖像 Native American individual, San Clemente Island. CA, USA (1,039-1,255 CE)
Sample ID: SC-04
USA Late Santa Cruz Island, California, USA 1039 CE - 1255 CE Island Chumash B2a5 Direct
AI生成的示例性肖像 America North Ancient individual, San Clemente Island. CA, USA (1,039-1,255 CE)
Sample ID: SC-04
USA The First Peoples of North America 1039 CE - 1255 CE B2a5 Direct
AI生成的示例性肖像 Native American individual, California. San Nicolas Island, USA (1,165-1,264 CE)
Sample ID: SN-53
USA Late San Nicolas Island, California, USA 1165 CE - 1264 CE Island Chumash B2a5 Direct
AI生成的示例性肖像 America North Ancient individual, California. San Nicolas Island, USA (1,165-1,264 CE)
Sample ID: SN-53
USA The First Peoples of North America 1165 CE - 1264 CE B2a5 Direct
AI生成的示例性肖像 Mesoamerican Civilizations individual, Iron Springs. Baja, Mexico (3,000 BCE-1,500 CE)
Sample ID: MX-01
Mexico Baja California, Mexico 3000 BCE - 1500 CE La Jolla B2a5 Direct
AI生成的示例性肖像 America North Ancient individual, Iron Springs. Baja, Mexico (3,000 BCE-1,500 CE)
Sample ID: MX-01
Mexico The First Peoples of North America 3000 BCE - 1500 CE B2a5 Direct
AI生成的示例性肖像 Native American individual, California. San Nicolas Island, USA (3,700 BCE-1,300 CE)
Sample ID: SN-10
USA Late San Nicolas Island, California, USA 3700 BCE - 1300 CE Island Chumash B2a5 Direct
AI生成的示例性肖像 Native American individual, California. San Nicolas Island, USA (3,700 BCE-1,300 CE)
Sample ID: SN-16
USA Late San Nicolas Island, California, USA 3700 BCE - 1300 CE Island Chumash B2a5 Direct
AI生成的示例性肖像 Native American individual, California. San Nicolas Island, USA (3,700 BCE-1,300 CE)
Sample ID: SN-01
USA Late San Nicolas Island, California, USA 3700 BCE - 1300 CE Island Chumash B2a5 Direct
AI生成的示例性肖像 Native American individual, California. San Nicolas Island, USA (3,700 BCE-1,300 CE)
Sample ID: SN-09
USA Late San Nicolas Island, California, USA 3700 BCE - 1300 CE Island Chumash B2a5 Direct
MATERNAL LINEAGE · ANCIENT DNA

古代世系证据地图

跟随母舰飞向这个分支 探索古代载体的发现地点

正在装入古老的观测...

标记是考古发现地点。一个破碎的连接器是连续分支之间一种不确定的、拟议中的地理过渡,辅以多个日期的观察;它不是一个准确的旅行路线、出生地或直接血统的证明。父系样本可能属于其他后代分支。在证据不足的地方,差距依然存在。样本日期与随机群形成日期不同。

参考简介

载体分布图

14 个古代 DNA 样本的地理分布，涵盖 B2A5 及其下游分支的携带者

直接承运人
时间段过滤器
所有时间段
显示全部样本
参考简介

时间分布

载体在考古时期的分布

参考简介

地理分布

按有记录的抽样国家计算,反映的是现有的参考选择,而不是人口频率。

参考简介

国家 × 大纪元发行

比较各国和考古时期记录的样本数量。选择一个人口密集的细胞来检查样本。

数据

数据证明( P)

来源信息和数据质量

上次更新 2026-02-16
信心分数 50/100
覆盖范围 Low

数据来源

分类、估计日期和地理背景反映了所记录的参考数据,随着证据的修订而可能发生变化,样本覆盖范围不均匀;所记录的地点和考古协会没有确定个人出身或文化特征。