Sexual chemistry keeps species alive but what if it fails? What if a mutation means that suddenly a chemical signal fails to find a receptor? There are a few examples where a change in chemistry visibly drives the separation of species, including a recent discovery where it is happening right now. I've discussed a few cases in my latest feature in C&I:
Chemical evolution
Chemistry & Industry Volume 84, Issue10 October 2020 Pages 22-26
access via:
Wiley Online Library (paywalled)
SCI (members)
Here's the first page with a picture of some yeasts whose sexual reproduction is also discussed in the feature:
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