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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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Incomplete Dominance01:43

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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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Multiple Allele Traits01:49

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Overview
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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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Genetic Variation01:25

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Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles,...
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Updated: Dec 28, 2025

Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Structural Variants May Be a Source of Missing Heritability in sALS.

Frances Theunissen1,2, Loren L Flynn1,3,4, Ryan S Anderton1,3,5

  • 1Perron Institute for Neurological and Translational Science, Nedlands, WA, Australia.

Frontiers in Neuroscience
|February 22, 2020
PubMed
Summary

Structural variants in the human genome may explain some cases of amyotrophic lateral sclerosis (ALS). Studying these genetic changes could reveal new insights into ALS pathogenesis and treatment strategies.

Keywords:
amyotrophic lateral sclerosisclinical trial stratificationgenetic markermissing heritabilitystructural variant

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Area of Science:

  • Genetics
  • Neuroscience
  • Genomics

Background:

  • Amyotrophic lateral sclerosis (ALS) pathogenesis is not fully understood.
  • Genetic factors, including structural variants like C9orf72 and ATXN2 repeats, are linked to ALS.
  • Many disease-associated structural variants are in poorly characterized genomic regions.

Purpose of the Study:

  • To investigate the role of structural variants in ALS.
  • To understand how these variants contribute to disease etiology and progression.
  • To identify potential genetic biomarkers for ALS patient stratification.

Main Methods:

  • Review of current literature on ALS genetics and structural variants.
  • Analysis of known structural variants associated with ALS.
  • Exploration of understudied genomic regions for novel variants.

Main Results:

  • Structural variants, particularly in uncharacterized genomic areas, are implicated in ALS risk.
  • These variants may influence gene expression, affecting disease severity and trajectory.
  • Understanding structural variants could help explain the missing heritability in sporadic ALS.

Conclusions:

  • Characterizing structural variants in ALS-associated genes is crucial for understanding disease mechanisms.
  • Genomic variants offer potential for improved patient stratification in clinical trials.
  • Further research into structural variations may unlock key insights into sporadic ALS genetics.