As a High-School Biology student in New Zealand, I am not required to know anything about embryology. And so, for the most part, I don’t. In the circumstances it seems that I am far from the only one.
Brian Thomas’ latest article on the Institute for Creation Research’s Daily (pseudo)Science Updates page is called Evolutionary Paradox: Embryos Resist Tinkering. From my experience over the last few months, Mr Thomas has two main ‘arguments’ on the subject of embryology: The first is that DNA is somehow not enough to explain the processes involved – for example in The Theory of Supernatural Embryology?, More Fruit Fly Larvae and the earlier Amber and Embryos – and that all mutations in the instructions for embryo development are lethal or close to – such as in Genetic Stop Sign Halts Evolutionary Explanations. This latest post belongs with the latter. Snails are related this time, rather than being entirely Drosophila related as is more usual, hence the following picture: