在植物化过程中选择的性质
Michael D Purugganan1, Dorian Q Fuller
1Department of Biology and Centre for Genomics and Systems Biology, 100 Washington Square East, New York University, New York 10003, USA. mp132@nyu.edu
Nature
|February 13, 2009
概括
植物化提供了丰富的进化见解,混合了遗传学和考古学. 研究作物化的研究揭示了植物和人类之间的选择性压力和共同进化动态.
科学领域:
- 进化生物学是进化生物学.
- 考古学的考古学
- 遗传学 遗传学 是一个
背景情况:
- 植物化是植物动物共同进化的关键例子.
- 它为理解进化过程提供了一个有价值的模型.
- 新石器时代的人类养殖实践在考古学上有很好的记录.
研究的目的:
- 探索植物化作为研究进化的一个模型.
- 整合遗传和考古数据,以获得全面的理解.
- 为了阐明驱动作物化的选择性压力.
主要方法:
- 基因分析以确定与化相关的基因.
- 考古研究以了解新石器时代的种植动态.
- 遗传和考古发现的综合.
主要成果:
- 已经确定了许多与植物化相关的基因.
- 考古证据澄清了新石器时代人类的种植习惯.
- 结合的方法可以增强对化的进化选择的理解.
结论:
- 植物化是进化研究的一个丰富的模型.
- 将遗传学和考古学结合起来,可以更深入地了解选择性压力.
- 这种合成扩大了我们对化过程中的进化选择的理解.
相关概念视频
01:32What is Natural Selection?
Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
01:46Types of Selection
Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
01:21Frequency-dependent Selection
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
01:38Limits to Natural Selection
Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
01:59Plant Breeding and Biotechnology
Crop cultivation has a long history in human civilization, with records showing the cultivation of cereal plants beginning at around 8000 BC. This early plant breeding was developed primarily to provide a steady supply of food.
01:06Natural Selection and Mating Preferences
The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
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