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Related Concept Videos

Human Genetics01:28

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Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
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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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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.
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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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Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
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Correlation means that there is a relationship between two or more variables (such as ice cream consumption and crime), but this relationship does not necessarily imply cause and effect. When two variables are correlated, it simply means that as one variable changes, so does the other. We can measure correlation by calculating a statistic known as a correlation coefficient. A correlation coefficient is a number from -1 to +1 that indicates the strength and direction of the relationship between...
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Large-Scale Multi-Omics Genome-Wide Association Studies Mo-GWAS: Guidelines for Sample Preparation and Normalization
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Trait Correlations in the Genomics Era.

Julia B Saltz1, Frances C Hessel2, Morgan W Kelly3

  • 1Rice University,6100 Main Street, Houston, TX 77005, USA.

Trends in Ecology & Evolution
|February 1, 2017
PubMed
Summary
This summary is machine-generated.

New genetic insights reveal trait correlations arise from pleiotropy and linkage, not as alternative mechanisms. This polygenic understanding refines evolutionary theories of trait covariation.

Keywords:
correlated charactersgenetic basislinkage disequilibriumpleiotropytrait correlations

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Area of Science:

  • Evolutionary genetics
  • Quantitative genetics

Background:

  • Traditional quantitative genetics focused on hypothetical loci for trait correlations.
  • Technological advancements allow identification of specific genetic variants underlying trait correlations.

Purpose of the Study:

  • To review studies on the genetic basis of trait correlations.
  • To understand what new genetic information reveals about trait correlations and their evolutionary implications.

Main Methods:

  • Literature review of studies investigating the genetic basis of trait correlations.
  • Analysis of findings regarding pleiotropy and genetic linkage.

Main Results:

  • Causal genetic variants can exhibit both pleiotropy and linkage, demonstrating they are not mutually exclusive.
  • Many trait correlations have a polygenic basis, involving multiple genes and variants.
  • Both pleiotropy and linkage appear to contribute to observed trait correlations.

Conclusions:

  • The genetic architecture of trait correlations is complex, involving intertwined pleiotropy and linkage.
  • Findings necessitate a revised understanding of the evolutionary causes and consequences of trait correlations.
  • Future research should consider the polygenic nature and combined mechanisms of trait correlation genetics.