Re: Atheist: "Do I take my child to church?"
Posted: Sun Apr 15, 2012 1:06 am
Geologists are also scientists who believe in long periods of time. No one has ever seen two continents separate and move thousands of miles apart, yet geologists still claim that is what happened.bippy123 wrote:If im not mistake all creationists believe in changes over time in allele, but adding macroevolution is from the imagination as again I state there has never been one instance that we have even observed macroevolution in a lab or anywhere for that matter, and then having a biologist calling it a broad pattern over long time spans is where you or he cant bring the evidence to support that last statement.
This is a blatant misrepresentation of Margulis' position. bippy is suggesting that Margulis was opposed to macroevolution. In fact, http://www.nytimes.com/2011/11/25/scien ... at-73.htmlbippy123 wrote:Lynn Margulis, a very well known biologist (former wife of Carl Sagan and an unbeliever herself) who wasnt afraid to speak out against the lack of evidence for macroevolution stated
And you don’t believe natural selection is the answer?
Lynn Margulis, Evolution Theorist, Dies at 73
Note: She proposed a different mechanism for "macroevolution". She did not oppose the idea of "macroevolution".She drew upon earlier, ridiculed ideas when she first promulgated her theory, in the late 1960s, that cells with nuclei, which are known as eukaryotes and include all the cells in the human body except mature red blood cells, evolved as a result of symbiotic relationships among bacteria.
The hypothesis was a direct challenge to the prevailing neo-Darwinist belief that the primary evolutionary mechanism was random mutation.
Rather, Dr. Margulis argued that a more important mechanism was symbiosis; that is, evolution is a function of organisms that are mutually beneficial growing together to become one and reproducing. The theory undermined significant precepts of the study of evolution, underscoring the idea that evolution began at the level of micro-organisms long before it would be visible at the level of species.
Read at least the second section quoted from the brief article in Nature. This is a major problem with relying on others for quotes instead of looking at the original material in context. By quoting this one sentence it appears that well-known evolutionary scientist Carroll has doubts about the validity of evolution itself. Nothing could be further from the truth.bippy123 wrote: here others state their doubt.
Yet there is a problem with macroevolution. Biologist Sean Carroll states, “A long-standing issue in evolutionary biology is whether the processes observable in extant populations and species (microevolution) are sufficient to account for larger-scale changes evident of longer periods of life’s history (macroevolution).”2
So what do these misrepresentations say about the motives and integrity of whoever originally compiled them?
http://www.nature.com/nature/journal/v4 ... 669a0.html
Evolutionary change occurs on different scales: 'microevolution' is generally equated with events at or below the species level whereas 'macroevolution' is change above the species level, including the formation of species. A long-standing issue in evolutionary biology is whether the processes observable in extant populations and species (microevolution) are sufficient to account for the larger-scale changes evident over longer periods of life's history (macroevolution).
Outsiders to this rich literature may be surprised that there is no consensus on this issue, and that strong viewpoints are held at both ends of the spectrum, with many undecided. Traditionally, evolutionary geneticists have asserted that macroevolution is the product of microevolution writ large, whereas some palaeontologists have advocated the view that processes operating above the level of microevolution also shape evolutionary trends. Is one of these views wrong, or could they both be right?
One obstacle to a more unified, multidisciplinary view of evolution is the vague meaning of the term macroevolution, and its different connotations in different disciplines. This is not merely a matter of semantics: scientific and broader public issues are at stake. The origins of major innovations and the underlying causes for the radiation of forms during various episodes in life's history are among the most interesting and challenging questions in biology. We must know whether, as G. G. Simpson asked, macro evolution differs fundamentally in kind or only in degree from microevolution. Furthermore, one of the latest political strategies of the creationist faction in the United States is to 'accept' microevolution but to bar macroevolution from the classroom on the misguided grounds that aspects of macroevolution are controversial and that therefore its scientific foundation is 'unproven'.
My argument has three parts. First, that the concept of macroevolution is better clarified when broken down into its two major component parts: phyletic and morphological evolution. Second, these two components are governed by at least partly distinguishable mechanisms. And third, because there is no evidence that the intrinsic genetic and developmental mechanisms underlying morphological evolution differ across any evolutionary scales, the distinction between these scales is really only descriptive, not mechanistic.
Macro- = Micro- = Evolution
The 'big picture' of evolution continues to grow, with diverse disciplines addressing biological mechanisms across many levels of organization (molecules, organisms, populations) and timescales. The subdivision of evolution into two scales no longer reflects our understanding of the unity and diversity of evolutionary mechanisms. However, more important than redefining macroevolution is recognizing that discipline- or scale-bound considerations of only one component of evolution, or of solely extrinsic or intrinsic mechanisms, are inadequate. Long-standing boundaries between evolutionary disciplines are dissolving, to allow richer concepts of evolution to emerge.