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Comparative Genomics definitions

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  • Comparative Genomics
    Field analyzing genomes from an evolutionary perspective to uncover gene origins, relationships, and evolutionary changes across species.
  • Homolog
    Gene sharing similar DNA sequence and evolutionary origin with another, regardless of whether it's in the same or different species.
  • Ortholog
    Gene in different species derived from a common ancestral gene, typically retaining similar function across organisms.
  • Paralog
    Gene related to another by duplication within the same organism, often diverging in function over time.
  • Phylogeny
    Evolutionary history and relationships among groups of organisms, often depicted as branching diagrams.
  • Parsimony
    Principle favoring the simplest evolutionary explanation when inferring relationships or gene origins.
  • Gene Duplication
    Process resulting in multiple copies of a gene within a genome, providing raw material for evolutionary innovation.
  • Synteny
    Conserved order of genes on chromosomes between different species, indicating evolutionary conservation.
  • Single Nucleotide Difference
    Variation at a single base pair position in DNA, contributing to genetic diversity between individuals or species.
  • Chromosomal Segment Duplication
    Repetition of large DNA regions within a genome, leading to structural variation between species.
  • Yolk Gene
    Genetic element essential for egg development, present in egg-laying mammals like platypuses but absent in most others.
  • Evolutionary Biologist
    Scientist investigating how genes and organisms change over time, often using comparative genomics and phylogenetic methods.
  • Egg-Laying Ancestor
    Hypothetical organism from which both egg-laying and non-egg-laying descendants evolved, inferred through genomic analysis.
  • Genomic Similarity
    Degree of resemblance in DNA sequences or gene content between different organisms, reflecting shared ancestry.
  • Conserved Gene Order
    Maintenance of the same sequence of genes across species, indicating evolutionary stability in genome structure.