Honeybees have haplodiploid sex determination. In humans, an X chromosome and a Y chromosome means that you’ll be a male (typically). Two X chromosomes will be a female. But bees do things differently; the queen bee will lay a ton of eggs, and these unfertilized eggs will each have one sex chromosome. If a male worker bee fertilizes an egg, it will develop into a female bee. Otherwise, the unfertilized eggs develop into males. Thus female bees have two sets of sex chromosomes (we term them ‘diploids’) and male bees only have one set of sex chromosomes (haploids).