Fri Jul 01, 2011 7:01 pm
Tue Jul 05, 2011 5:05 pm
First of all, Darwin had no idea about DNA. At the time, when he lived, the DNA was not known yet, especially not as an inheritance material.
Second, all of your cells contain the same genome, yet they are different. However, that's not epigenetics, only regulation of genes. Nevertheless, this has nothing to do with evolution.
Where does it say that similar genotype aren't capable of producing different phenotypes?
By the way why do you use the term "Darwinism"? Does it make you feel any better?
Tue Jul 05, 2011 5:44 pm
Mon Jul 11, 2011 11:21 am
Mon Jul 11, 2011 7:33 pm
scottie wrote:The standard theory states that random mutations to the genome cause (gradually) the different phenotypic changes does it not?
Are you subscribing to a different theory?
scottie wrote:By the way why do you use the term "Darwinism"? Does it make you feel any better?
I use the term “Darwinisn” simply because that is a term used by many adherents to the theory themselves.
I feel neither better or worse in using it.
Would you like me to use another term? If so please let me know and I will try to oblige so long as it is not in any way abusive or inflammatory.
Mon Jul 11, 2011 7:35 pm
Thu Jul 14, 2011 11:42 am
"These authors broadly agree with Darwin's view that the most important evolutionary changes at the level of the visible phenotype, as revealed by paleontological and systematic studies, have resulted from natural selection acting on variation within populations. This variation is ultimately due to mutations that arise at random with respect to the direction of selection."
".. The pattern of morphological stasis for most lineages and the sudden appearance of new forms is contrasted with the alternative mode of gradual evolution of species."
Thu Jul 14, 2011 4:18 pm
My reference to metamorphosis simply illustrates that changes in phenotype do not require changes in genotype
as the theory states. Something else is at work.
Fri Jul 15, 2011 10:10 am
Mon Jul 18, 2011 11:51 am
This variation is ultimately due to mutations that arise at random with respect to the direction of selection."
There are perhaps differing views at the edges of this but the foundation pillar is the random mutation of genome filtered by natural selection from a common ancester and that this process is gradual.
In the book he gives various ideas about a seemingly complex mechanism coming about from many different gradual steps, that were previously unseen.
Mon Jul 18, 2011 12:12 pm
“Margulis' original hypothesis proposed that aerobic bacteria (that require oxygen) were ingested by anaerobic bacteria (poisoned by oxygen), and may each have had a survival advantage as long as they continued their partnership.”
“1. . The timeline of life on Earth:
a. Anaerobic bacteria: Scientists have fossil evidence of bacterial life on Earth ~3.8 billion years ago. At this time, the atmosphere of the Earth did not contain oxygen, and all life (bacterial cells) was anaerobic.”
Mon Jul 18, 2011 1:19 pm