相关实验视频
Updated: Jun 11, 2025

08:57
Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
Published on: August 14, 2018
15.8K
了解物种的极限,通过形成植物地理谱系
Frank T Burbrink1, Edward A Myers2, R Alexander Pyron3
1Department of Herpetology American Museum of Natural History New York New York USA.
Ecology and evolution
|October 4, 2024
概括
植物地理学方法可以通过整合遗传,环境和空间数据来区分物种. 这项研究确定了12种不同的蛇物种,揭示了分歧模式和混合区动态.
科学领域:
- 进化生物学是进化的生物学.
- 遗传学 是一个遗传学.
- 生态生态学 生态生态学
背景情况:
- 用植物地理方法评估物种化结果,在一个极端有明确的物种,在另一个极端有侵入性种群.
- 变种的"灰色地带"涉及遗传上不同的,但在生态上相互作用的血统,在进化物种概念下可能代表物种.
研究的目的:
- 开发和应用将物种划界与物种化过程结合在一起的测试.
- 通过空间和时间来评估历史的人口统计,多样化和血统维护.
- 为了区分不同的物种和本地适应的种群.
主要方法:
- 合成物种划界与物种化过程分析.
- 探索空间和基因组临界线,基因型与环境的相互作用,以及对选定位置的基因组扫描.
- 对八对北美蛇血统对进行了测试.
主要成果:
- 在8个蛇系对中,有6对被确定为12个不同的物种,而2对则显示出当地适应和区域人口结构.
- 独特的物种对在普莱斯托纪中期左右分离,表现出低迁移和稳定的混合区,在生态区域过渡时具有选择的位置.
- 当地适应的人口较年轻,迁移较高,生态差异较小.
结论:
- 综合空间,时间和环境数据的族群地理和人口遗传方法可以界定相互作用的血统.
- 该研究成功地区分了真实物种和经历了基于分歧时间和遗传交换模式的本地适应的种群.
- 基因组和环境数据对于理解物种化动态和定义物种界限至关重要.
相关概念视频
Evolutionary Relationships through Genome Comparisons
5.7K
Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
5.7K
Phylogenetic Trees
45.2K
Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.
45.2K
Gene Evolution - Fast or Slow?
7.0K
The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
In contrast, regions which code...
7.0K
Phylogeny
43.7K
Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
43.7K
Formation of Species
39.1K
Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
39.1K
The Evidence for Evolution
42.5K
Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
42.5K

