If you are missing a finger from an accident and you want children with the normal 5 digits, you can use heritability to work out that finding a wife with 6 fingers isn’t going to get you back to normal.
Another one is if you are gay and you want gay children, the low heritability of sexual orientation indicates that finding a gay gamete donor won’t help much.
On the other hand if you are short and want taller children, you might put a lot of effort into finding a wife who is taller than average (heritability of height tells you that this will work).
If you are missing a finger from an accident and you want children with the normal 5 digits, you can use heritability to work out that finding a wife with 6 fingers isn’t going to get you back to normal.
Another one is if you are gay and you want gay children, the low heritability of sexual orientation indicates that finding a gay gamete donor won’t help much.
On the other hand if you are short and want taller children, you might put a lot of effort into finding a wife who is taller than average (heritability of height tells you that this will work).