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Related Concept Videos

Convergent Evolution01:54

Convergent Evolution

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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
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Synteny and Evolution02:31

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John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
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Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I,...
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Updated: Mar 29, 2026

Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues
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Homology, convergence and parallelism.

Michael T Ghiselin1

  • 1California Academy of Sciences, 55 Music Concourse Drive, San Francisco, CA 94118, USA mghiselin@calacademy.org.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|November 25, 2015
PubMed
Summary
This summary is machine-generated.

Homology describes shared ancestry between biological structures, even if they change over time. Analogy, however, is similarity without common ancestry, and convergence can create misleading homoplasies.

Keywords:
analogyconvergencecorrespondencehomologyparallelismphilosophy

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Area of Science:

  • Evolutionary Biology
  • Comparative Anatomy

Background:

  • Homology is a fundamental concept for understanding evolutionary relationships and biological form.
  • Distinguishing homology from analogy is crucial for accurate phylogenetic reconstruction.

Purpose of the Study:

  • To clarify the definitions and distinctions between homology, analogy, and related evolutionary processes.
  • To explain the concept of homoplasy and its origins in processes like convergence, divergence, and parallelism.

Main Methods:

  • Conceptual analysis of evolutionary relationships.
  • Examination of definitions in comparative anatomy and evolutionary biology.

Main Results:

  • Homology is defined by common ancestry and is a transitive relation.
  • Analogy is correspondence without common ancestry.
  • Convergence, divergence, and parallelism are processes that can lead to homoplasy, which are misleading similarities.

Conclusions:

  • Clear definitions of homology and analogy are essential for evolutionary studies.
  • Understanding processes like parallelism and convergence is key to interpreting homoplasy and avoiding phylogenetic errors.