I was re-reading Harry Potter and the Methods of Rationality and came across the part where Harry tries to explain genetics—
*cough* If you haven’t read this fanfiction, it’s pretty darn awesome. Harry Potter meets Science.
—anyway, I won’t spoil it, but they were talking about a certain genetic trait. The phenotype is either +W or -W, and they were trying to figure out what the genotype was. Harry explains the monohybrid cross you probably learned about in high school Bio, where there are two alleles, W and w. To find out how the genotype and phenotype relate, they…