Genes that come together with different alleles are called heterozygous.

Here's a breakdown:

* Gene: A segment of DNA that codes for a specific trait.

* Allele: An alternative form of a gene.

* Heterozygous: Having two different alleles for a particular gene.

For example, if a gene for eye color has two alleles, one for blue eyes (B) and one for brown eyes (b), a person with one B allele and one b allele would be heterozygous for eye color.