Horizontal evolution explained

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. Clemenza . Liliana . Subramanian . Bala . Hourcade . Dennis . Nickells . Michael . Atkinson . John . Primary sequence of baboon CR1 demonstrates concerted evolution within the CR1 gene . Molecular Immunology . Elsevier BV . 34 . 4 . 1997 . 0161-5890 . 10.1016/s0161-5890(97)00040-0 . 297–304. 9244342 .
2. Evolution of Aminoacyl-tRNA Synthetases—Analysis of Unique Domain Architectures and Phylogenetic Trees Reveals a Complex History of Horizontal Gene Transfer Events. Yuri I. . Wolf. L. . Aravind. Nick V. . Grishin. Eugene V. . Koonin. 10.1101/gr.9.8.689. 9. 8. Genome Research. 1999-09-09. 689–710 . 10447505 . free.