There's no specific term for an organism possessing two dominant or two recessive genes for a single trait. Here's why and the terminology you should use:

* Homozygous: This term describes an organism with two identical alleles (versions) for a specific gene.

* Homozygous dominant: Two dominant alleles (e.g., AA)

* Homozygous recessive: Two recessive alleles (e.g., aa)

* Heterozygous: This term describes an organism with two different alleles for a specific gene (e.g., Aa).

It's important to note: The terms "dominant" and "recessive" describe how alleles interact, not the number of alleles.