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Related Concept Videos

Inheritance01:25

Inheritance

444
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...
444
Law of Segregation01:49

Law of Segregation

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When crossing pea plants, Mendel noticed that one of the parental traits would sometimes disappear in the first generation of offspring, called the F1 generation, and could reappear in the next generation (F2). He concluded that one of the traits must be dominant over the other, thereby causing masking of one trait in the F1 generation. When he crossed the F1 plants, he found that 75% of the offspring in the F2 generation had the dominant phenotype, while 25% had the recessive phenotype.
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Chromosomal Theory of Inheritance01:39

Chromosomal Theory of Inheritance

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In 1866, Gregor Mendel published the results of his pea plant breeding experiments, providing evidence for predictable patterns in the inheritance of physical characteristics. The significance of his findings was not immediately recognized. In fact, the existence of genes was unknown at the time. Mendel referred to hereditary units as “factors.”
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Genetic Variation01:25

Genetic Variation

340
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,...
340
Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

58.9K
In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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Dihybrid Crosses01:18

Dihybrid Crosses

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Overview
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Related Experiment Video

Updated: Aug 6, 2025

High-throughput Screening for Protein-based Inheritance in S. cerevisiae
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High-throughput Screening for Protein-based Inheritance in S. cerevisiae

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Beyond Mendelian Inheritance: Genetic Buffering and Phenotype Variability.

Andrea Rossi1, Zacharias Kontarakis2,3

  • 1Genome Engineering and Model Development Lab (GEMD), IUF-Leibniz Research Institute for Environmental Medicine, 40225 Düsseldorf, Germany.

Phenomics (Cham, Switzerland)
|March 20, 2023
PubMed
Summary
This summary is machine-generated.

Genes are not the sole determinants of traits; gene expression, environmental factors, and genetic mechanisms like compensation influence phenotypes. Advanced technologies help uncover these complex genotype-phenotype relationships.

Keywords:
Genetic compensationModifiersPhenotypesPhenotypic plasticityTranscriptional adaptation

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Area of Science:

  • Genetics and Genomics
  • Molecular Biology
  • Developmental Biology

Background:

  • Phenotype is shaped by genes, but identical genotypes can yield different phenotypes.
  • Gene expression variability and external factors influence cellular behavior.
  • Understanding the genotype-phenotype axis is crucial in biological research.

Purpose of the Study:

  • To explore mechanisms beyond genes that influence phenotype.
  • To discuss genetic and epigenetic factors contributing to phenotypic variation.
  • To highlight the utility of modern technologies in dissecting these mechanisms.

Main Methods:

  • Review of genetic and epigenetic mechanisms affecting phenotype.
  • Discussion of modifier genes, genetic redundancy, and compensation.
  • Exploration of transcriptional adaptation, environmental stressors, and phenotypic plasticity.

Main Results:

  • Genes alone do not fully determine phenotype; gene expression and environmental factors play significant roles.
  • Mechanisms such as genetic compensation and transcriptional adaptation can alter phenotypic outcomes.
  • Induced pluripotent stem cells (iPSCs) and genome engineering aid in studying these variations.

Conclusions:

  • The relationship between genotype and phenotype is complex and influenced by multiple layers of regulation.
  • Advanced sequencing and genome engineering technologies are vital for uncovering hidden genetic and epigenetic influences.
  • Further research into these mechanisms will enhance our understanding of biological diversity and disease.