"For Darwin, natural selection is a drawn-out, complex process involving multiple interconnected causes. Natural selection requires variation in a population of organisms. For the process to work, at least some of that variation must be heritable and passed on to organisms’ descendants in some way. That variation is acted upon by the struggle for existence, … Continue reading Natural Selection
Tag: Darwin
Cambrian Explosion
"The hox genes are, more or less, the standard library for the structural assembly of animal bodies. It’s a DNA-modifying type of gene, one that activates specific other regions of DNA during early development. Need a leg? Activate the ‘leg’ hox gene, and that will start a huge cascade of related processes that make a … Continue reading Cambrian Explosion
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