>>19120525Generally what people find difficult about defining real world objects is that there is usually no single defining trait, but instead clusters of traits, for which any single trait is not absolutely necessary.
>What is a cat?A small, furry animal with pointed ears and long fangs
>ah, but this cat lacks furBut it still possesses the other traits of cats
>ah, but this cat lacks pointed earsBut it still possesses the other traits
>ah, but this cat is very largeBut it still possesses the other traits
>What is a door?A solid rectangle with a handle and hinges to allow opening and closing of a pathway through a wall
>ah, but door lacks a handle and is simply pushed to openBut it still possesses the other traits
White people are a cluster of traits including fair skin, high nose bridge, backset eyes, relatively pointed nose, thin lips, and tall foreheads.
You can find "white" person with a negro-like nose or thick lips, but they still possess the other white traits.
Genetics works the exact same way. No single gene or SNP defines whites, but it's the overall cluster or grouping or genetic traits.
