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Related Concept Videos

Genomic Imprinting and Inheritance02:30

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...
Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
Pleiotropy01:33

Pleiotropy

Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
Epistasis01:39

Epistasis

In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
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Epistasis Analysis01:09

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...

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Related Experiment Video

Updated: May 28, 2026

Instrumentation of Near-term Fetal Sheep for Multivariate Chronic Non-anesthetized Recordings
14:40

Instrumentation of Near-term Fetal Sheep for Multivariate Chronic Non-anesthetized Recordings

Published on: October 25, 2015

A common cause for a common phenotype: the gatekeeper hypothesis in fetal programming.

S McMullen1, S C Langley-Evans, L Gambling

  • 1School of Biosciences, University of Nottingham, Sutton Bonington, Loughborough LE12 5RD, UK.

Medical Hypotheses
|November 4, 2011
PubMed
Summary

Maternal suboptimal nutrition during pregnancy can lead to offspring metabolic syndrome, including hypertension and obesity. This study proposes a "gatekeeper hypothesis," suggesting common gene pathways mediate these long-term health effects regardless of the specific nutritional insult.

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Determining the Role of Maternally-Expressed Genes in Early Development with Maternal Crispants

Published on: December 21, 2021

Area of Science:

  • Developmental biology
  • Nutritional science
  • Metabolic disorders

Background:

  • Sub-optimal nutrition during pregnancy has long-term health consequences for offspring.
  • Common outcomes include hypertension, obesity, dyslipidaemia, and insulin resistance, collectively termed metabolic syndrome.
  • Nutritional insults during early development, such as low protein, high fat, or iron deficiency diets in rats, are linked to metabolic and cardiovascular disorders.

Purpose of the Study:

  • To propose the

Main Methods:

  • Literature review and hypothesis formulation.
  • Examination of existing research on nutritional programming.
  • Postulation of potential molecular mechanisms and gene pathways.

Main Results:

  • Identification of a unifying hypothesis for diverse nutritional insults.
  • Proposal of

Conclusions:

  • Nutritional insults during pregnancy may converge on common genetic pathways, termed