相关实验视频
Updated: Jun 24, 2025

09:57
2D and 3D Chromosome Painting in Malaria Mosquitoes
Published on: January 6, 2014
10.3K
染色体数量和基因组大小变化的进化模式与热带红的分类学多样性具有正相关性
Aleena Xavier1, Ritu Yadav1, Vinita Gowda1
1Tropical Ecology and Evolution (TrEE) Lab, Department of Biological Sciences, Indian Institute of Science Education and Research (IISER), Bhopal, 462066, Madhya Pradesh, India.
American journal of botany
|June 3, 2024
概括
在Zingiberaceae生中发生的多化事件影响了染色体数量和基因组大小,推动了分类学多样性和更广泛的地理分布. 这些细胞遗传变化还减少了基因组大小,增加了侵入性.
科学领域:
- 植物学 植物学
- 进化生物学 进化生物学
- 遗传学 遗传学 是一个
背景情况:
- 细胞遗传特征,包括染色体数量和基因组大小,对于分类血管精子和理解多倍体化等进化过程至关重要.
- 虽然细胞遗传特征已被记录在生科中,但它们对生多样性和生物地理学的影响仍然在很大程度上未被探索.
- 细胞遗传特征的地理变异对于理解植物进化至关重要,但研究不足.
研究的目的:
- 调查细胞遗传特征在塑造津比拉科 (Zingiberaceae) 家族中的分类学多样性和生物地理模式中的作用.
- 为了测试染色体数量和基因组大小进化的模型在Zingiberaceae.
- 确定血统年龄,分类学多样性和分布范围是否解释了细胞遗传特征的变化.
主要方法:
- 构建了一个时间校准的贝叶斯系遗传树,用于3个津比拉属子家族的290个种类.
- 应用相关性,通用线性模型和家族遗传最小平方模型来分析细胞遗传特征进化.
- 在家族 (Zingiberaceae) 和属 (Hedychium) 层面检查了细胞遗传变异.
主要成果:
- 多多体化和半多多体化是津比拉系中最常见的染色体数量变化 (~57%) ,上升性失调性 (~27%) 也很重要.
- Zingiberoideae亚系表现出下降性失调性,而Alpinioideae则在内部节点表现出多质化.
- 染色体数量和基因组大小的更高变异与增加的分类学多样性和更广泛的生物地理分布相关,尽管染色体数量和基因组大小没有得到证实.
结论:
- 在辛吉伯属中发生了多重多化事件,显著影响了细胞遗传进化.
- 在Zingiberaceae中发生的细胞遗传事件似乎导致了基因组大小的减少.
- 这些细胞遗传变化与增加的分类学多样性,扩大分布范围和增强的侵入性有关Zingiberaceae.
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
The Evidence for Evolution
42.7K
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.
42.7K
Synteny and Evolution
3.2K
John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
3.2K
Genetics of Speciation
19.2K
Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
19.2K
Gene Evolution - Fast or Slow?
7.1K
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...
7.1K
Gene Duplication and Divergence
6.1K
The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
6.1K

