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