An organism that carries both the dominant and recessive versions of a particular trait is called a heterozygote.

Here's a breakdown:

* Heterozygous: Means having two different alleles (versions) of a gene.

* Dominant: The allele that is expressed even when paired with a recessive allele.

* Recessive: The allele that is only expressed when paired with another recessive allele.

For example, let's say the gene for eye color has two alleles: brown (B) and blue (b). A person with brown eyes could have the following genotypes:

* BB: Homozygous dominant (two brown alleles)

* Bb: Heterozygous (one brown allele and one blue allele)

Since brown is dominant, both BB and Bb individuals will have brown eyes. The only way to have blue eyes is to be bb (homozygous recessive).