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Polygenic Traits01:18

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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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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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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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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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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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Related Experiment Video

Updated: Jul 16, 2025

Navigating MARRVEL, a Web-Based Tool that Integrates Human Genomics and Model Organism Genetics Information
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Polygenic scores ignore development and epigenetics, dramatically reducing their value.

David S Moore1

  • 1Psychology Field Group, Pitzer College, Claremont, CA, USAdmoore@pitzer.edu; http://pzacad.pitzer.edu/~dmoore/.

The Behavioral and Brain Sciences
|September 11, 2023
PubMed
Summary
This summary is machine-generated.

Polygenic scores fail to explain behavioral traits like intelligence or predict developmental outcomes. Epigenetic mechanisms, influenced by experiences, demonstrate how genes function to shape phenotypes, supporting this critique.

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Area of Science:

  • Behavioral genetics
  • Molecular biology
  • Developmental psychology

Background:

  • Polygenic scores are statistical tools estimating the combined effect of many genetic variants on traits.
  • Behavioral phenotypes, such as intelligence, are complex and influenced by numerous factors.
  • Previous critiques have questioned the utility of polygenic scores for understanding complex behaviors.

Purpose of the Study:

  • To evaluate the explanatory power of polygenic scores for behavioral phenotypes.
  • To assess the potential for polygenic scores in developing behavioral interventions.
  • To examine the biological mechanisms underlying phenotype development in light of genetic scoring limitations.

Main Methods:

  • Review of existing literature on polygenic scores and behavioral genetics.
  • Analysis of molecular biology principles, focusing on gene-environment interactions and epigenetics.
  • Critique of polygenic score methodology based on biological plausibility.

Main Results:

  • Polygenic scores do not elucidate the causal mechanisms of behavioral phenotypes.
  • The predictive power of polygenic scores for individual developmental trajectories is limited.
  • Molecular evidence, particularly epigenetic modifications, highlights the dynamic interplay between experience and genome function.

Conclusions:

  • Polygenic scores are insufficient for understanding the biological underpinnings of complex behaviors like intelligence.
  • The limitations of polygenic scores suggest they are unlikely to lead to effective behavioral interventions.
  • Epigenetic regulation provides a more comprehensive framework for understanding how experiences shape phenotypes through genome function.