对灯 (Petromyzontiformes) 的遗传学研究
Brianna Smith1, Alexandra Walling1, Rachel Schwartz1
1Department of Biological Sciences, College of the Environment and Life Sciences, University of Rhode Island, 120 Flagg Road, Kingston, RI 02881, United States.
Molecular phylogenetics and evolution
|October 7, 2023
概括
兰普雷的进化是复杂的. 新的基因组数据揭示了不同的北方和南方鱼物种,并建议重新分类Lethenteron和Eudontomyzon属.
科学领域:
- 进化生物学 进化生物学
- 基因组学就是基因组学.
- 动物学 动物学
背景情况:
- 由于有限的形态和遗传数据,Lamprey的进化历史受到争议.
- 之前的研究产生了不一致的结果,关于物种关系和分类单基.
研究的目的:
- 使用全基因组数据来解决鱼的进化关系.
- 为了研究鱼群的单一性和物种关系.
主要方法:
- 分析了11个全球鱼物种的全基因组序列.
- 识别了正统学家,构建了族系学.
主要成果:
- 遗传学分析清楚地分开了北方和南方的鱼物种.
- 莱特伦和欧顿托米松属显示出与当前分类学不一致的遗传学关系.
结论:
- 基因组数据提供了对鱼生物地理学的更清晰的了解.
- 莱特龙和欧顿托米松属需要根据新的遗传学证据进行分类学重新分类.
相关概念视频
02:54Evolutionary Relationships through Genome Comparisons
5.8K
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...
5.8K
03:21Phylogenetic Trees
45.4K
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.
45.4K
01:51Lampbrush Chromosomes
2.4K
2.4K
01:23Phylogeny
44.2K
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.
44.2K
02:05Gene Evolution - Fast or Slow?
7.2K
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...
7.2K
02:40The Tree of Life - Bacteria, Archaea, Eukaryotes
32.5K
The “tree of life” describes the evolution of life and the evolutionary relationships between organisms. The root of the tree is the common ancestor to all life on Earth. All other species radiate from this point, much like the branches of a tree. The numerous tips of these branches on the tree of life represent every living, or extant, species. Extinct species, which are species that no longer exist, can be found towards the center of the tree. Currently, these organisms, both...
32.5K