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01:23Phylogeny
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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.
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02:22Introduction to Plant Diversity
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From Water to Land
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02:26Non-vascular Seedless Plants
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The diverse plant life on Earth—consisting of nearly 400,000 species—can be divided into three broad categories based on biological characteristics: nonvascular, seedless vascular, and seed plants.
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02:35What is Evolutionary History?
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Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
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02:55The Evidence for Evolution
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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.
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01:24Evolution of New Traits in Microbes
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Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
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植物进化:发展的故事.
1Department of Cell and Developmental Biology, John Innes Centre, Norwich NR4 7UH, UK. liam.dolan@bbsrc.ac.uk
Cell
|May 31, 2008
概括
两个TALE主体蛋白调节单细胞绿藻Chlamydomonas的发展. 这一发现表明,TALE基因进化在藻类祖先的陆地植物出现中发挥了作用.
科学领域:
- 发育生物学是发展生物学.
- 进化生物学是进化的生物学.
- 遗传学 是一个遗传学.
背景情况:
- 塔尔家庭主体蛋白质是真核细胞中发育的关键调节者.
- 单细胞绿藻Chlamydomonas作为研究基本生物过程的模型生物体.
