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Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

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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.
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Natural selection, a fundamental concept in evolutionary biology, is the mechanism by which evolution is driven, favoring organisms that are best adapted to their environments. This process enhances their chances of survival and reproduction. Adaptation, a key outcome of this process, involves genetic modifications that optimize an organism's functionality under specific environmental challenges, such as extreme cold or thinner air at high altitudes.
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Epigenetic Regulation01:46

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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Transcription

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Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
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Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
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Inheritance01:25

Inheritance

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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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Updated: Sep 11, 2025

Stable Isotope In-Vivo Labeling for Mass-Spectrometry Identification of Paternal Metabolites Transferred from Sperm to Oocyte During Fertilization
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Adaptation and changing phenotypes through transgenerational epigenetics.

Lon J Van Winkle1,2, Rebecca J Ryznar3, Philip M Iannaccone4

  • 1Department of Biochemistry, Midwestern University, Downers Grove, IL, USA.

Epigenetics
|August 13, 2025
PubMed
Summary
This summary is machine-generated.

Epigenetic changes, induced by environment, can be passed down through generations in plants and animals. This transgenerational epigenetic inheritance impacts evolution and disease risk, like obesity and type 2 diabetes.

Keywords:
Epigeneticsadaptationenvironmentevolutionphenotypetransgenerational

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Area of Science:

  • Genetics and Epigenetics
  • Developmental Biology
  • Evolutionary Biology

Background:

  • Noncoding epigenetic modifications to DNA and histones can be transmitted across generations in eukaryotes.
  • Environmentally induced epigenetic alterations profoundly influence gene expression patterns.

Discussion:

  • Transgenerational epigenetic inheritance is well-established in plants and invertebrates, with growing evidence in vertebrates, including humans.
  • These inheritance mechanisms have significant implications for phenotypic plasticity and evolutionary trajectories.
  • Understanding these processes is crucial for addressing the heritability of complex diseases such as type 2 diabetes and obesity.

Key Insights:

  • Epigenetic marks provide a mechanism for environmentally responsive inheritance.
  • Phenotypic traits and disease predispositions can be influenced by ancestral environmental exposures.
  • Epigenetic inheritance plays a role in both adaptation and disease etiology.

Outlook:

  • Further research into epigenetic inheritance mechanisms will illuminate evolutionary processes.
  • Investigating transgenerational epigenetic inheritance offers potential therapeutic targets for metabolic and other complex disorders.
  • Comparative studies across diverse taxa will refine our understanding of the universality and specificity of these epigenetic phenomena.