Horizontal evolution

The phrase horizontal evolution is used in evolutionary biology to refer to:

  • Concerted evolution, whereby individual members of a DNA family within one species are more closely related to each other than to members of the same type of DNA family in other species;[1]
  • Horizontal gene transfer, where genes are transferred from one organism to another by means other than genes received from an ancestor[2]

It is sometimes used by creationists as a synonym for

  • Microevolution, development of genetic changes below the speciation threshold

References
  1. EG: "Primary sequence of baboon CR1 demonstrates concerted evolution within the CR1 gene", Clemenza et al. doi:10.1016/S0161-5890(97)00040-0
  2. EG: "Evolution of Aminoacyl-tRNA Synthetases—Analysis of Unique Domain Architectures and Phylogenetic Trees Reveals a Complex History of Horizontal Gene Transfer Events", Wolf et al. doi:10.1101/gr.9.8.689
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