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Related Concept Videos

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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Behavioral Genetics and Its Designs01:23

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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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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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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.
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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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Gregor Mendel's pioneering work on the principles of inheritance fundamentally transformed our understanding of how traits are transmitted from generation to generation. His experiments with pea plants laid the groundwork for the discovery of genes, discrete units within organisms that control heredity.
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Navigating MARRVEL, a Web-Based Tool that Integrates Human Genomics and Model Organism Genetics Information
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Genetic nurturing, missing heritability, and causal analysis in genetic statistics.

Hao Shen1, Marcus W Feldman2

  • 1Department of Biology, Stanford University, Stanford, CA 94305.

Proceedings of the National Academy of Sciences of the United States of America
|September 29, 2020
PubMed
Summary

Genetic nurturing complicates heritability estimates by linking parental genes to child traits. New causal models help disentangle genetic nurturing from other factors like population structure.

Keywords:
correlation and causalitycultural transmissiongenetic nurturingmissing heritabilitypopulation subdivision and assortative mating

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Area of Science:

  • Behavioral genetics
  • Quantitative genetics
  • Gene-culture interaction

Background:

  • Genetic nurturing, where parental genotypes influence offspring phenotypes via transmission, is a key aspect of gene-culture interactions.
  • Traditional heritability estimates can be confounded by genetic nurturing, potentially explaining the "missing heritability" phenomenon.

Purpose of the Study:

  • To model genetic nurturing using a gene-culture cotransmission framework.
  • To investigate the impact of genetic nurturing on heritability interpretation.
  • To develop a unified causal framework for genetic nurturing, population subdivision, and assortative mating.

Main Methods:

  • A one-locus, two-phenotype gene-culture cotransmission model was employed.
  • Regression analysis was used to assess children's phenotypes against transmitted and nontransmitted alleles.
  • Causal analysis was applied to identify and evaluate direct and indirect effects within a unified framework.

Main Results:

  • Genetic nurturing complicates the interpretation of heritability and the "missing heritability" problem.
  • Factors like population subdivision and assortative mating produce similar statistical signals to genetic nurturing.
  • A unified causal framework successfully disentangles the effects of genetic nurturing, population subdivision, and assortative mating.

Conclusions:

  • Accurate estimation of genetic nurturing requires correcting for confounding factors such as population subdivision and assortative mating.
  • Causal analysis provides a robust method for clarifying assumptions in genetic effect estimations.
  • The developed framework offers a more precise understanding of genetic and environmental influences on phenotypes.