Heads or Tales

How Evolutionary Theory "Predicts" What It Finds

In Salvo 29, we saw that biology textbooks often overstate the degree of similarity between the earliest stages of vertebrate embryonic development when making the case for common ancestry. Some evolutionary biologists acknowledge that vertebrate embryos begin development very differently, but still claim that embryos pass through a highly similar stage midway through development, called the "pharyngula" (or also the "phylotypic" or "tailbud") stage.

These theorists propose an "hourglass model" of development, where it is claimed that similarities between embryos during this convergent midpoint stage provide evidence for common ancestry (see...


is a senior editor of Salvo and is co-founder of the Intelligent Design & Evolution Awareness (IDEA) Center and Program Officer in Public Policy and Legal Affairs at the Discovery Institute.

This article originally appeared in Salvo, Issue #30, Fall 2014 Copyright © 2020 Salvo | www.salvomag.com https://salvomag.com/article/salvo30/heads-or-tales


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