Saturday, October 14, 2017

Creationists questioning pseudogenes: the beta-globin pseudogene

Jonathan Kane recently (Oct. 6, 2017) posted an article on The Panda's Thumb where he claimed that Young Earth Creationists often don't get enough credit for raising serious issues about evolution [Five principles for arguing against creationism].

He mentioned some articles about pseudogenes as prime examples. I asked him for references and he responded with two articles by Jeffrey Tomkins that were published on the Answers in Genesis website. The first was on the β-globin pseudogene and the second was on the GULO pseudogene. Both articles claim that these DNA sequences aren't really pseudogenes because they have functions.

I'll deal with the β-globin pseudogene in this post and the GULO pseudogene in a subsequent post.

Wednesday, October 11, 2017

Historical evolution is determined by chance events

Modern evolutionary theory is based on the idea that alleles become fixed in a population over time. They can be fixed by natural selection if they confer selective advantage or they can be fixed by random genetic drift if they are nearly neutral or slightly deleterious [Learning about modern evolutionary theory: the drift-barrier hypothesis]. Alleles arise by mutation and the path that a population follows over time depends on the timing of mutations [Mutation-Driven Evolution]. That's largely a chance event.