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相关概念视频

Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

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Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
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Gene-Environment Interactions01:20

Gene-Environment Interactions

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Gene expression is a dynamic process that is significantly influenced by environmental factors. This interaction underlies the complex nature of biological development and the phenotypic differences observed among individuals, even among those with identical genetic makeups. Factors such as radiation, temperature, behavior, nutrition, and stress play pivotal roles in determining how genes are expressed. The concept of the reaction range is central to understanding this interaction. It posits...
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Behavioral Genetics and Its Designs01:23

Behavioral Genetics and Its Designs

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Behavior genetics explores how genetic inheritance influences human behavior. It focuses on how genes, passed from parents to offspring, contribute to the development of behavioral traits and tendencies. This branch of genetics seeks to understand the complex interplay between inherited genetic factors and environmental influences in shaping our behaviors.
The primary methodologies used in behavior genetics include family studies, twin studies, and adoption studies, each providing unique...
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Epistasis Analysis01:09

Epistasis Analysis

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Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
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Heritability01:06

Heritability

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Heritability is a statistical concept that measures the degree to which genetic differences among individuals contribute to trait variations within a population. It is a fundamental idea in genetics, often prone to misinterpretation. Heritability is expressed as a percentage, reflecting the proportion of variation in a specific trait across a population that can be linked to genetic differences. However, it's important to understand that heritability does not determine how "genetic"...
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Epistasis01:39

Epistasis

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In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
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相关实验视频

Updated: Jun 2, 2025

Large-Scale Multi-Omics Genome-Wide Association Studies Mo-GWAS: Guidelines for Sample Preparation and Normalization
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通过控制多基因背景效应来识别QTL与环境的相互作用.

Fuping Zhao1, Lixian Wang1, Shizhong Xu2

  • 1State Key Laboratory of Animal Biotech Breeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China.

Journal of genetics and genomics = Yi chuan xue bao
|January 13, 2025
PubMed
概括

本研究引入了一种新的线性混合模型,通过环境 (Q × E) 相互作用来检测定量特征位置 (QTL). 该方法提高了各种环境中复杂特征的遗传分析的准确性.

关键词:
主要影响主要影响进行元分析分析.混合模型的混合模型.多基因背景的多基因背景Q × E 相互作用的相互作用.

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Forward Genetic Approach to Uncover Stress Resistance Genes in Mice &#8212; A High-throughput Screen in ES Cells
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Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry
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相关实验视频

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科学领域:

  • 遗传学 遗传学 是一个
  • 量化遗传学 量化遗传学
  • 生物信息学是一种生物信息学.

背景情况:

  • 通过环境 (Q × E) 相互作用检测定量特征位置 (QTL) 是具有挑战性的,因为难以控制基因组背景.
  • 现有的方法,如元分析和综合复合间隔映射,在功率和准确性上有局限性.

研究的目的:

  • 开发和验证一个线性混合模型,以对Q × E相互作用进行可靠的检测.
  • 改进在多个环境中对复杂特征的分析.

主要方法:

  • 提出了一种线性混合模型,结合了两个亲属矩阵来控制主要和相互作用多基因效应.
  • 模拟数据用于将拟议模型与现有方法进行比较.
  • 应用该模型来分析多种环境中的大米和大麦的农学特征.

主要成果:

  • 拟议的模型在模拟中显示出比元分析和包含性复合间隔映射更高的统计能力.
  • 确定了大米7号染色体上显著的Q×E相互作用,影响谷数,产量和1000粒重量,在PROG1和Ghd7.7基因附近.
  • 检测到六个区域与大麦寄宿的Q × E相互作用,这些区域重叠与先前识别的单核酸多态 (SNP).

结论:

  • 开发的线性混合模型是检测Q × E相互作用的强大而稳健的工具.
  • 该模型为多环境研究中复杂特征的遗传结构提供了宝贵的见解.
  • 这种方法促进了植物育种和农业研究中的遗传分析.