Submitted by insink2300 t3_11drr8s in askscience
owiseone23 t1_jac29v1 wrote
Reply to comment by aartadventure in Why does temperature determine the sex of certain egg laying animals like crocodiles? by insink2300
it's not uncommon for traits to evolve across "fitness valleys". That is, a trait with positive fitness that requires multiple generations to evolve with intermediate generations having negative fitness.
With a large population and a lot of time, random variation makes it possible to evolve across fitness valleys.
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