Update: done! Finding the right colour was an ordeal, but I managed it (read comments for more details if you're really interested)
So today was the day of almost-last-minute present shopping and Biology revision.
Today I learnt about inherited characteristics, and their reasons: deoxyribose nucleic acid, otherwise known as DNA.
Today I bought my mother some nail varnish I thought she'd been wanting.
Today I realised that I'd bought the wrong colour, Damsel in a Dress instead of Sole Mate.
Today I remembered that my intense fussiness when it comes to gifts is shared with dearest mother through my inherited picky allele.
What do I do??? Yes, they are incredibly similar colours... but DiaD is much more purpleish than the red-tinted SM. I might g a chance to purchase the right colour tomorrow, but it's out of my way and not certain. What woud you do?