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相关概念视频

Multiple Allele Traits01:49

Multiple Allele Traits

The Concept of Multiple Allelism
Polygenic Traits01:18

Polygenic Traits

When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...
Pleiotropy01:33

Pleiotropy

Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
Multiple Allele Traits01:49

Multiple Allele Traits

The Concept of Multiple Allelism
Incomplete Dominance01:43

Incomplete Dominance

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.
Polygenic Traits01:18

Polygenic Traits

When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...

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相关实验视频

Updated: Jun 20, 2026

A Quantitative Fitness Analysis Workflow
11:39

A Quantitative Fitness Analysis Workflow

Published on: August 13, 2012

Pleitotropic 缩放和 QTL 数据的使用情况.

Joachim Hermisson1, Alistair P McGregor

  • 1Fakultät für Mathematik and Max F. Perutz Laboratories, University of Vienna, Nordbergstr. 15, 1090 Vienna, Austria. joachim.hermisson@univie.ac.at

Nature
|December 5, 2008
PubMed
概括

对基因型-表型图的新研究表明,具有较高类型的突变具有更大的影响. 然而,由于QTL区域含有多个突变,这一发现可能会受到偏差,这与以前的模型相矛盾.

科学领域:

  • 遗传学 是一个遗传学.
  • 进化生物学 进化生物学
  • 发展生物学 发展生物学

背景情况:

  • 了解基因型和表型之间的关系对于进化和遗传学研究至关重要.
  • 基因型-表型图的复杂性及其对突变效应的影响仍然是积极研究的领域.
  • 之前的模型根据类型水平提出了基因突变效应的不同分布.

研究的目的:

  • 研究基因型-表型图的复杂性如何影响突变效应的分布.
  • 分析类和对定量特征突变效应的大小之间的关系.
  • 根据新的经验数据重新评估现有模型.

主要方法:

  • 定量特征位置 (QTL) 映射分析在小鼠的70个骨特征上进行.
  • QTLs的总效应与受影响的特征数量 (类型水平) 相比回归.

主要成果:

  • 瓦格纳等人. 瓦格纳等人. 报告说,具有较高类型的突变对每个受影响的特征表现出更大的平均影响.
  • 这一发现与一些先前确立的理论模型相矛盾.
  • 这项研究强调了解释类型和突变效应大小之间的关系的潜在复杂性.

结论:

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QTL Mapping and CRISPR/Cas9 Editing to Identify a Drug Resistance Gene in Toxoplasma gondii

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  • 观察到较高的类型和更大的突变效应之间的相关性可能受到未考虑的因素的影响.
  • 在单个QTL区域内可能存在多个突变的可能性可能会引入偏差,解释与先前模型的差异.
  • 需要进一步的研究来完善复杂遗传系统中突变效应和类型的模型.