Another Layer on the Information Story: Quorum Sensing

I was recently directed to a video lecture on the phenomenon of quorum sensing, the mechanism by which bacteria communicate with one another to establish the population density of micro-organisms of their own kind within their proximal environment. Bonnie Bassler, the lecturer in this video, does a masterful job of portraying fairly technical concepts and ideas to a lay-audience. The purpose of quorum sensing is essentially to ensure that sufficient cell numbers of a given species are present before initiating a response that requires the population density to be above a certain threshold. A single bacterial cell secreting a toxin into a eukaryotic organism is not likely to do the host any harm and would waste resources. If, however, all Read More ›

Yet More “Junk DNA” Not-so-Junk After All

Proponents of intelligent design (ID) have long predicted that many of the features of living systems which are said to exhibit “sub-optimal” design will, in time, turn out to have a rationally engineered purpose. This is one of several areas where ID actively encourages a fruitful research agenda, in a manner in which neo-Darwinian evolution does not. One such area, and a field for which I have long held an inquisitive fascination for, is the subject of so-called “junk DNA,” and the non-coding stetches of RNA which are transcribed from them. Skepticism of the “junk DNA” paradigm is not a phenomenon which is limited to proponents of ID. This popular view of the genome — while still resonating as the Read More ›

Academic Freedom Under Fire — Again!

A news article published yesterday on haaretz.com reported that the Israeli Education Minister has dismissed their chief scientist, Dr Gavriel Avital, over — wait for it — questioning particular elements of two theories, specifically those pertaining to Darwinian evolution and global warming.The article reports, Dr. Gavriel Avital has generated controversy in the past for his statements questioning the validity of Darwin’s theory of evolution. He has also challenged conventional theory on pollution’s effects on global warming. “Someone who holds the opinions of Avital cannot serve as chief scientist of the Education Ministry,” said a ministry official. [emphasis mine] What was Dr Avital’s crime? Let’s hear it straight from the horse’s mouth:

“Is Intelligent Design Viable?” William Lane Craig vs. Francisco Ayala

[Ed. Note: The previously published version of this post referred to Francisco Ayala as “of the BioLogos Foundation.” While Dr. Ayala has been a guest blogger with BioLogos, he is not directly affiliated with the foundation.] Late last year, the eminent Christian philosopher and proponent of intelligent design, William Lane Craig, crossed swords in debate with the avid apologist for Darwinian evolution, Francisco Ayala. The debate was chaired by philosopher of physics Bradley Monton of the University of Colorado, an ID sympathizer, though a convinced atheist himself. Monton is the author of the book, Seeking God in Science: An Atheist Defends Intelligent Design. A fascinating ID the Future interview with Professor Monton can be downloaded here. Following Dr. Ayala’s opening Read More ›

If Darwinian Evolution Can’t Fix Broken Genes, How Can It Create New Ones?

The Darwinian model of evolution holds that one of the key mechanisms of evolutionary innovation is the duplication of genes and the subsequent divergence of one of the duplicate copies to undertake a new functional role. Because a probability of a single gene stumbling upon a significantly different (yet functionally advantageous) sequence is so small, the idea is that, following a duplication of a gene, one copy is able to retain the original function, while the other is free to explore the vast sea of combinatorial possibilities in search of some novel function. It is widely believed that a duplicate gene has no phenotypic cost or advantage associated with it – that is, it is selectively neutral. In such a Read More ›