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相关概念视频

Law of Independent Assortment02:03

Law of Independent Assortment

55.1K
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.
55.1K
Law of Segregation01:49

Law of Segregation

65.2K
When crossing pea plants, Mendel noticed that one of the parental traits would sometimes disappear in the first generation of offspring, called the F1 generation, and could reappear in the next generation (F2). He concluded that one of the traits must be dominant over the other, thereby causing masking of one trait in the F1 generation. When he crossed the F1 plants, he found that 75% of the offspring in the F2 generation had the dominant phenotype, while 25% had the recessive phenotype.
65.2K
Dihybrid Crosses01:18

Dihybrid Crosses

74.6K
Overview
74.6K
Incomplete Dominance01:43

Incomplete Dominance

22.0K
Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
22.0K
Genetic Variation01:25

Genetic Variation

268
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,...
268
Position-effect Variegation02:32

Position-effect Variegation

6.3K
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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相关实验视频

Updated: Jun 12, 2025

Navigating MARRVEL, a Web-Based Tool that Integrates Human Genomics and Model Organism Genetics Information
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在门德尔随机化中探索和计算遗传驱动效应异质性.

Annika Jaitner1, Krasimira Tsaneva-Atanasova2,3, Rachel M Freathy1

  • 1Department of Clinical and Biomedical Sciences, Faculty of Health and Life Sciences, University of Exeter, Exeter, UK.

Genetic epidemiology
|September 23, 2024
PubMed
概括

这项研究引入了结合孟德尔随机化 (MR) 和药物遗传学的新方法,以分析因果关系和遗传异质性. 这种方法估计了吸烟.

关键词:
在阿尔斯帕克 (ALSPAC) 地区.出生的体重出生时的体重.有关因果推理的推理.不同质性的异质性门德尔的随机化是门德尔的随机化

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In Vivo Modeling of the Morbid Human Genome using Danio rerio
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Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation
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相关实验视频

Last Updated: Jun 12, 2025

Navigating MARRVEL, a Web-Based Tool that Integrates Human Genomics and Model Organism Genetics Information
09:37

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In Vivo Modeling of the Morbid Human Genome using Danio rerio
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科学领域:

  • 流行病学 流行病学
  • 统计遗传学 统计遗传学
  • 药物遗传学 药物遗传学

背景情况:

  • 门德尔随机化 (MR) 通过使用遗传变异作为工具变量来估计因果关系.
  • 一个关键的MR假设是同质性,这意味着因果效应在仪器水平上不变.
  • 药物遗传学积极寻求精准医学的基因驱动效应异质性.

研究的目的:

  • 将TWIST框架与MR结合起来,用于分析平均因果关系和遗传异质性.
  • 提出两种用于估计基因驱动效应异质性的新方法.
  • 在具有和没有风险等位基因的基因组中单独估计因果关系.

主要方法:

  • 使用了传统的MR和TWIST框架的组合.
  • 开发了两种新的方法,包括尊重同质性和违反同质性的遗传变异.
  • 应用于ALSPAC研究数据的方法,检查怀孕期间的吸烟和后代的出生体重.

主要成果:

  • 该研究成功估计了吸烟对出生体重的因果作用中的遗传驱动效应异质性.
  • 对于具有不同的戒烟基因倾向的母亲,因果关系单独估计.
  • 在现实世界的观测数据集中证明了新方法的实用性.

结论:

  • 开发的方法有效地描述了平均因果效应和基因驱动的效应异质性.
  • 这种综合方法通过识别具有差异治疗效果的子组来推进精准医学.
  • 这些发现提供了关于遗传学,吸烟和后代出生体重之间的复杂相互作用的见解.