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Inheritance

Inheritance

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.
Each gene exists in pairs, and the combination of these genes from both parents forms an individual's genotype. This genotype is a blueprint of potential traits. Examples of genotype...

Epistasis Analysis

Epistasis Analysis

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...

Genomic Imprinting and Inheritance

Genomic Imprinting and Inheritance

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.
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...

Incomplete Dominance

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.

Genetic Lingo

Genetic Lingo

Polygenic Traits

Polygenic Traits

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Related Experiment Video

Updated: Apr 11, 2026

Navigating MARRVEL, a Web-Based Tool that Integrates Human Genomics and Model Organism Genetics Information

Navigating MARRVEL, a Web-Based Tool that Integrates Human Genomics and Model Organism Genetics Information

Published on: August 15, 2019

Genetic modifiers and oligogenic inheritance.

Maria Kousi¹, Nicholas Katsanis¹

¹Center for Human Disease Modeling, Duke University, Durham, North Carolina 27710.

Cold Spring Harbor Perspectives in Medicine

|June 3, 2015

Summary

This summary is machine-generated.

Identifying genetic modifiers is key to understanding disease variability. This review explores methods and implications for genetic disorder research and drug development.

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Navigating MARRVEL, a Web-Based Tool that Integrates Human Genomics and Model Organism Genetics Information

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Published on: August 15, 2019

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Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry

Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry

Published on: June 21, 2018

Area of Science:

Genetics
Genomic Medicine
Molecular Biology

Background:

Genetic disorders arise from mutations, but their effects (penetrance and expressivity) are influenced by the genetic background.
Identifying genetic modifiers, which alter the impact of causal mutations, presents significant methodological challenges.
Advances in identifying modifier alleles are crucial for understanding disease variability.

Purpose of the Study:

To review the genetic properties and behaviors of modifiers.
To highlight conceptual and technological tools for modifier mapping and cloning.
To discuss the role of modifiers in elucidating biological pathways and improving clinical outcomes.

Main Methods:

Analysis of studies in patient populations and model organisms.
Review of conceptual and technological tools for modifier identification.
Discussion of modifier mapping and cloning strategies.

Main Results:

Modifier alleles significantly influence the penetrance and expressivity of causal mutations.
Identification of modifiers aids in dissecting complex genetic phenomena.
Advanced tools and strategies are improving the ability to map and clone modifier genes.

Conclusions:

Modifier identification enhances our understanding of genetic disorder mechanisms.
Modifiers offer potential for improving the clinical predictive value of genetic tests.
Discovering modifiers can lead to the development of novel therapeutic targets for genetic diseases.