The Saiyan Race are based on Aryan Vikings. That’s why they’re all white and turn blonde when they power up. Their genes are so dominant that they can create Saiyans even by breeding human females. So-called “half Saiyans” aren’t really halflings when they inherit everything their Saiyan father has, such as tails, zenkai boosts and SSJ transformations. Even in the Fusion Reborn movie Hitler wanted to hire Saiyans seeing them as Übermensch.
This is why Bulma was colonised by Vegeta, the Prince of all Saiyans. He needed to re-create the noble Saiyan bloodline, hehe.