Diversity within a species-that is, variation-they called "microevolution," and the hypothesis of the development of new species was termed "macroevolution."
variations can never create new genetic information, and are thus unable to bring about "evolution." Giving variations the name of "microevolution" is actually an ideological preference on the part of evolutionary biologists.
The impression that evolutionary biologists have given by using the term "microevolution" is the false logic that over time variations can form brand new classes of living things. And many people who are not already well-informed on the subject come away with the superficial idea that "as it spreads, microevolution can turn into macroevolution."
In fact, nowadays even evolutionist experts accept that the variations they call "microevolution" cannot lead to new classes of living things-in other words, to "macroevolution." In a 1996 article in the leading journal Developmental Biology, the evolutionary biologists S.F. Gilbert, J.M. Opitz, and R.A. Raff explained the matter this way:
The Modern Synthesis is a remarkable achievement. However, starting in the 1970s, many biologists began questioning its adequacy in explaining evolution. Genetics might be adequate for explaining microevolution, but microevolutionary changes in gene frequency were not seen as able to turn a reptile into a mammal or to convert a fish into an amphibian. Microevolution looks at adaptations that concern only the survival of the fittest, not the arrival of the fittest. As Goodwin (1995) points out, "the origin of species- Darwin's problem-remains unsolved.34
The fact that "microevolution" cannot lead to "macroevolution," in other words that variations offer no explanation of the origin of species, has been accepted by other evolutionary biologists, as well. The noted author and science expert Roger Lewin describes the result of a four-day symposium held in November 1980 at the Chicago Museum of Natural History, in which 150 evolutionists participated:
The central question of the Chicago conference was whether the mechanisms underlying microevolution can be extrapolated to explain the phenomena of macroevolution. …The answer can be given as a clear, No.35
34 Scott Gilbert, John Opitz, and Rudolf Raff, "Resynthesizing Evolutionary and Developmental Biology", Developmental Biology, 173, Article no. 0032, 1996, p. 361. (emphasis added)
35 R. Lewin, "Evolutionary Theory Under Fire", Science, vol. 210, 21 November, 1980, p. 883.
Macro and microevolution are the same process.
"There is no difference between micro- and macroevolution except that genes between species usually diverge, while genes within species usually combine. The same processes that cause within-species evolution are responsible for above-species evolution, except that the processes that cause speciation include things that cannot happen to lesser groups, such as the evolution of different sexual apparatus (because, by definition, once organisms cannot interbreed, they are different species).
The idea that the origin of higher taxa, such as genera (canines versus felines, for example), requires something special is based on the misunderstanding of the way in which new phyla (lineages) arise. The two species that are the origin of canines and felines probably differed very little from their common ancestral species and each other. But once they were reproductively isolated from each other, they evolved more and more differences that they shared but the other lineages didn't. This is true of all lineages back to the first eukaryotic (nuclear) cell. Even the changes in the Cambrian explosion are of this kind, although some (eg, Gould 1989) think that the genomes (gene structures) of these early animals were not as tightly regulated as modern animals, and therefore had more freedom to change. "
http://www.talkorigins.org/faqs/macroevolution.html