Natural selection and the scientific peer review process

Natural selection describes the process by which variations in a population of organisms is edited out over time to enhance the ability of the individual organisms to survive and reproduce in an environment. Even if over 90% of all mutations, being random, are harmful to the next generation, natural selection can still eliminate those and keep those others that are beneficial, thus countering the destructive effects of mutations in general.

It is the same with the scientific peer review process. Because science has made so much progress over the past few centuries, most people have the impression that scientists are unusually brilliant, nearly infallible, and totally objective in their views and methods. But in fact, that is simply not the case for most of them, at least as individuals. Scientists can be just as mistaken, corrupt, dogmatic, and failing in their efforts and assumptions as the rest of humanity. A few of them can even be downright stupid!

If that is true, how can science be trusted to produce reliable facts and theories? Because the scientists use peer review as their means to test any new ideas put on the table by one of their number. No scientist’s word need be taken at face value. In order for his idea to be accepted as anything beyond a speculation, he must show observational or experimental data, clearly defined, that supports it. Thus, it should always be possible for other scientists to duplicate the results of the first scientist making the claim. If attempts to duplicate the observations or experiments do not produce the same result, the idea is rejected.

Sometimes the peer review process goes too far in its skepticism, and a valid idea, such as continental drift, is rejected and even ridiculed by scientists even though it explains all the data collected and is contradicted by none of it. But that’s why repeated testing of that idea is required, as long as it is not outright falsified. Continental drift WAS accepted in the 1960s once an overwhelming amount of evidence was found to support it and those geologists who had been bigoted against it in the 1920s had died or retired, and a new generation had arisen that was more open-minded. Those who supported the continental drift theory were able to come up with a mechanism, plate tectonics, that explained it, and once they did opposition to it faded away rapidly.

Individual scientists may fall so deeply in love with their own ideas that they refuse to accept the peer review process when it rejects their ideas. Then they become cranks who no longer do science, but instead put out propaganda to appeal to the scientifically illiterate. This is especially true of Creationists and global warming denialists who happen to have science degrees. They even go so far as to attack the peer review process itself! But it must be noted that they can never produce anything that would produce superior results in terms of seeking objective data in the universe and explaining it.

Scientists who refuse to recognize that an idea of theirs is wrong are like a population of organisms that are too specialized in their lifestyle to adapt to any sudden change in their environment, resulting in their extinction. Fortunately, the progress of science continues even in spite of such incidents, just as life on Earth has continued despite the mass extinctions that have wiped out most species that evolved on Earth before.

Lunacy from a racist “Christian”

As much as I despise Ben Stine for making that idiotic Expelled movie that attacks evolution as an inspiration for the Nazi Holocaust and portrays Intelligent Design promoters as martyrs, what’s even worse is when some deranged psycho slams Stine himself for attacking racism as well. I think I’ll just copy and paste the entire piece of nonsense to show what was done. I hope you have your bathroom door open, in case you feel like puking!

http://tarobb.blogspot.com/2008/04/trap-is-set.html

Censorship in the name of religious freedom?

I’ve never seen such a blatant attempt at denial of academic freedom! Now, if the people being attacked were committing libel, this lawsuit would make sense. This is a clear example of hypocrisy!

http://www.pacificjustice.org/resources/news/focusdetails.cfm?ID=PR080512a

An Evolutionary View of Religion

Considering that most of the opposition to evolution is based on religious bias, it is ironic that evolutionary concepts are most useful for explaining the history of religion. It is common knowledge, for example, that Christianity evolved from Judaism, Buddhism evolved from Hinduism, the Baha’i Faith evolved from Islam, and that Christianity has diversified into hundreds of sects including Roman Catholicism, the Southern Baptist Convention, the Russian Orthodox Church, and the Church of Jesus Christ of Latter Day Saints. Thus religions themselves illustrate the concepts of common ancestry, mutation, and adaptive radiation as well as mass extinctions (many pagan religions died out as Christianity and Islam expanded, leaving behind “fossils” in the form of published records that are today dismissed as “myths”).

And now I wish to dispel one of the most common misconceptions about evolution: That because humans evolved from ape-like animals, that humans are by nature superior to their ape cousins. And that evolution is a ladder of progress in which all decendants are by nature superior to their ancestors. It is ludicrious to suggest that fish are inferior to mammals. Both fish and mammals are animals well adapted to their environments. If they were not, they’d become extinct. Most fish cannot breath air and thus cannot survive out of water, but the reverse is true of most mammals, which would die if they could not breath air. So from a fish’s point of view, a mammal must seem inferior, even the whales, which must also rely on their lungs to breath, not gills. Evolution is all about change, not progress. A fish is merely different from a mammal, period.

Likewise, Judaism is different from Christianity. There is no reason for Christians to think themselves or their faith superior to the Jewish faith, except by their own arrogance. Judaism has been in existence longer than Christianity, but it has also evolved just as Christianity has. For a Christian to convert to Judaism is not to take a “backward step”, merely to adopt a different set of teachings.

Thus, I totally reject the Baha’i concept of “Progressive Revelation” that implies that the Baha’i Faith is the supreme religion because it came after all the others, and that other religions are valid but destined to be replaced by the Baha’i Faith. Must we assume that because mammals came later than fish, they are destined to replace all fish? NO, that is nonsense! In my view all religions must be seen as equal because all of them have evolved and adapted to their environment. Until this is understood by nearly everyone, wars and discrimination based on religious bigotry will remain a serious threat.

PZ Myers fan here!

I am a regular reader of the blog by PZ Myers, a biologist and associate professor at the University of Minnesota, Morris.

http://scienceblogs.com/pharyngula/

A critical test of common descent (evolution)

While there are ways to experimentally test the process of evolution, known as natural selection, by mimicking it artificially, ways to test the historical issue of evolution, known as common descent, must rely on making observations and making predictions of the outcome of those observations.Inside the cells of all Eukaryota (plants, animals, fungi, and protists) are organelles called mitochondria. Likewise, inside the cells of plants are organelles called chloroplasts. Both mitochondria and chloroplasts have their own DNA and are thought to be descended from bacteria that took up residence inside the larger cells. In any case, the DNA in those organelles are completely different from the DNA in the nuclei of those same cells.

We can take the DNA of cell nuclei and check them to see if the differences between those of various organisms can enable us for build a family tree of those organisms. The more similar their nuclear DNA is, the more closely related they are. But since mitochondria and chloroplasts also have DNA, we could also take them and check to see if we could build up a family tree that is the same as the one we would build up with the nuclear DNA.

Indeed, there is no reason, if all life was produced by a single recent act of creation, for the DNA of the mitochondria of all animals to be significantly different from each other. So if I was a Creationist, especially of the young Earth kind, I would predict that it would be impossible to make a family tree from mitochondria DNA, or if I did, it would be completely different from the nuclear DNA. But if I was testing the theory of common decent, I would predict that the readings in animals of both their nuclear and mitochondrial DNA would produce the SAME FAMILY TREE in all cases! This would make perfect sense if the mitochondria and the rest of the cells have been evolving together ever since they first came together over a billion years ago.

Mitochondrial DNA is already used in forensics to determine who the mother of a child is, while nuclear DNA must be used to determine the father of that same child. This would only be an extension of that function, since the parents of the child must be of the same species, or at least very closely related, to even produce offspring at all.

A Real Skeptic vs. a Denialist

A skeptic is defined as someone who reserves judgement on an issue until enough evidence is found to support a claim beyond a reasonable doubt and also clearly defines what would make him disbelieve a claim. This is scientific thinking.

By contrast, a denialist has no such defined limits, either of belief or disbelief. The denialist starts from a position of dogma, asserting opposition to an idea by presenting a contrary idea as absolute truth and interpreting all evidence according to that unalterable dogma, rather than draw conclusions based only on the evidence. This is the opposite of scientific thinking, although denialists often use scientific terminology to make their positions seem legitimate to fool the ignorant.

Denialism vs geuine skepticism is found in debates over evolution vs. Creationism, global warming, religion, and politics. If there were no denialists, most of those debates would have either ended long ago, or would be a lot more cordial than they tend to be.

Why the term “species” should be abolished

The term “species” has a clear definition in biology: a group of organisms that breed only among themselves and do not breed with members of any other group. Thus, as far as we can tell, humans are all members of the same species, Homo sapiens. 

The lesser black backed gull and the herring gull of Britain, however, act like separate species, yet are connected to each other by a ring of subspecies that extend all around the Northern Hemisphere and can interbreed with their neighbors. So in the sense I stated above, the definition of species breaks down.

The issue of species also fails when asexual life forms are considered, including bacteria, most protists, a few populations of beetles, a population of lizards, and an entire class of rotifers called Bdelloidea. The lizards, beetles and rotifers in question are all females, while among the single celled organisms the issue of gender identity is meaningless.

Suppose we have a population of 400 asexually reproducing lizards which are genetically and physically almost identical. One at a glance would assume they are members of the same species. But because the lizards do not swap genes via sexual reproduction, they would just as well be considered 400 separate species.

The issue of “species” becomes meaningless when one considers extinct organisms that are dug up as fossils. Fossils cannot breed among themselves and so the designation of certain fossils as Homo hablis, Homo egaster, and Homo sapiens is entirely arbitrary, based on the structure of the fossils and nothing more. The same is true of all other organisms in the fossil record, including dinosaurs.

I would therefore argue that the term “species” is really useless and should be abolished completely, because it is a source of unnecessary confusion.

The Absurdity of Denialism

I’d like to plug this blog, which is one of my favorites:

http://scienceblogs.com/denialism/

Denialism is defined and explained in some detail here:

http://scienceblogs.com/denialism/about.php

A useless debate

The crazy thing about debating with Creationist hypocrites is that they have ZERO facts that actually support their case, but plenty of rhetorical tricks. I was reminded of that by a “Sirius Knott” who plastered some lame comments on one of my blogs. Here’s the confrontation between him (SK) and me (DH), for those who care to follow it: