It's a cliché (and Truth in Television) that when a parent finds that their child's goldfish or other beloved pet has died, they'll try to replace it with a new one and pretend the original pet never died. The Replacement Goldfish trope is when a character follows this line of thinking to fill in the emotional void of a loss they've suffered. The Motherly Scientist is someone who legitimately loves the new creation for themselves; either as the original creator or surrogate. When a lonely Evilutionary Biologist fills the void by cloning himself, he is a Truly Single Parent.