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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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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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植物の進化: 発展の物語
1Department of Cell and Developmental Biology, John Innes Centre, Norwich NR4 7UH, UK. liam.dolan@bbsrc.ac.uk
Cell
|May 31, 2008
まとめ
2つのTALEホメオドメインタンパク質は,単細胞の緑藻,クラミドモナスの発達を調節する. この発見は,TALE遺伝子の進化が,藻類の祖先から陸上の植物の出現に役割を果たしたと示唆しています.
科学分野:
- 発達生物学 発達生物学とは
- 進化生物学の進化生物学について
- 遺伝学 遺伝学とは
背景:
- TALEホメオドメインタンパク質は,エウカリオット全体での発達の重要な調節因子である.
- 単細胞の緑藻であるクラミドモナスは,基本的な生物学的プロセスを研究するためのモデル生物として機能しています.
