Macroevolution
Macroevolution is the theory that natural selection can, given enough time, lead to the creation of new clades which are groups of organisms consisting of a single common ancestor and all the descendants of that ancestor. Macroevolution may require a large number of mutations, though it may also come about as a result of a gross genetic change. For instance, there are two species of grey tree frogs in North America; one has two sets of chromosomes, and one has four. From an evolutionary perspective, this is the result of a random failure in meiosis in a generation of tree frogs which led to a new genetic makeup for one of the species.
The scientific data regarding mutations causing the changes necessary for macroevolution has been seen by some as damaging to the macroevolutionary position. [1]
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References
- â Bergman, Jerry, Darwinism and the Deterioration of the Genome, Creation Research Society Quarterly 42(2), 2005.