10 days… and counting…

In evolutionary theory, there is the notion, supported by physical evidence, that two species can develop the same or very similar traits in parallel. Not being a biologist, I can’t, off the top of my head, think of any particular examples, but let’s imagine that a sparrow and a baboon were plonked in a closed environment full of blue trees, where there was a carnivorous predator who was equally fond of the taste of sparrows and baboons. There would be pretty much equal pressure – would there not? – in order for the sparrow and the baboon to survive as a species, for them to develop the ability to turn blue at will (or perhaps even evolve such that they are of a permanently blue hue), thus blending into the trees and reducing their chances of serving as the primary food source of the aforementioned sparrow and baboon eating predator.

In light of the above, I would like an evolutionary biologist to explain to me the reason for the following…

Why, although we have “evolved” largely separately from each other over the last eighteen years (and therefore one could say, in a short term behavioural-type context, we have evolved into different “species”), have both my dad and I…

a. decided our favourite, pretty much exclusive to all others, breakfast cereal is Malties (in his case the Morrison’s version, in my case Sainsbury’s)?

b. become vehemently (ish) averse to buying a new wallet and thus carry our loose change around in one of those plastic moneybag jobbies you get from the bank?

& c. become, in the eyes of our respective partners, “a bit whingey” about the fact that we don’t like the “pots” (aka. the “washing up”) to be tossed higgledy-piggledy into the sink, as opposed to being stacked neatly on the side, despite the fact that our respective partners lament the lack of “side” onto which the “pots” can be stacked, during the preparation of meals and so forth, thus necessitating the higgledy-piggledy tossing therein?

Explain that, Darwin!

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