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相关概念视频

Trihybrid Crosses02:27

Trihybrid Crosses

23.2K
Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal...
23.2K
Dihybrid Crosses01:18

Dihybrid Crosses

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Overview
74.7K
Monohybrid Crosses01:20

Monohybrid Crosses

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Overview
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Genetic Variation01:25

Genetic Variation

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Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles,...
273
Light Acquisition02:16

Light Acquisition

8.4K
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
8.4K
Law of Independent Assortment02:03

Law of Independent Assortment

55.6K
While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
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相关实验视频

Updated: Jun 22, 2025

Micron-scale Phenotyping Techniques of Maize Vascular Bundles Based on X-ray Microcomputed Tomography
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Micron-scale Phenotyping Techniques of Maize Vascular Bundles Based on X-ray Microcomputed Tomography

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结构变异有助于玉米的表型变化.

Nathan S Catlin1,2,3, Husain I Agha1,3, Adrian E Platts1

  • 1Department of Plant Biology, Michigan State University, East Lansing, MI, 48824, USA.

bioRxiv : the preprint server for biology
|July 1, 2024
PubMed
概括

本研究引入了一种新的方法,用于检测玉米中的结构变异 (SV),包括可转移元素 (TEs),使用短读序列. 这种方法将SV与重要的生命史特征和基因型与环境相互作用联系起来.

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Author Spotlight: Improved Methods for Preparing Transverse Sections and Unrolled Whole Mounts of Maize Leaf Primordia for Fluorescence and Confocal Imaging
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科学领域:

  • 遗传学 是一个遗传学.
  • 基因组学就是基因组学.
  • 玉米生物学 玉米生物学

背景情况:

  • 鉴定特征变异的遗传位置是困难的,因为检测各种遗传变异的局限性.
  • 结构变异 (SV),特别是可转移元素 (TE),影响表型变异,但很难用标准方法检测.
  • 现有的短读测序数据分析方法经常错过多态VS和TE.

研究的目的:

  • 开发和应用一种方法来检测玉米中的多态SV和TEs,使用短读测序数据.
  • 为了对已识别的SV进行大量的玉米多样性面板的基因型.
  • 将SV多态与生命史特征和基因型与环境 (GxE) 相互作用联系起来.

主要方法:

  • 两种玉米基因型之间的全基因组对齐,以识别多态SVs.
  • 使用短读序列数据和对齐支持,对大型玉米多样性小组进行基因型定型.
  • 对具有表型特征和GxE相互作用的SV的关联分析.

主要成果:

  • 开发了一种技术,在一个大型玉米面板上对SV多态基因型进行基因定型.
  • SV多态性与生命史特征和GxE相互作用有关.
  • 大多数与特征相关的SV含有TE;一些可能是删除,而另一些则表示TE插入. 一个TE插入显示了显著的基因表达关联.

结论:

  • 开发的方法使得大量人群中SV存在/缺乏变异的基因定型成为可能.
  • 包括TEs在内的SV变异有助于玉米的特征变异和GxE相互作用.
  • 虽然SV与特征有关,但这些关联在很大程度上与附近的SNP存在联系不平衡.