An organism that carries two unique genes (alleles) for a trait is called a/an

Organisms that carry two genes or alleles for particular traits are called diploid organisms. Humans are a good example of diploid organisms, which means we get each half of our genes from our parents. A diploid organism carrying two unique alleles for a single trait is called a "heterozygote", while a diploid organism with two identical alleles for a single trait is called a "homozygote".

Cloud to ground, cloud to cloud and ground to cloud.