What is another word for homozygous?

There isn't a single perfect synonym for "homozygous," as it has a very specific meaning in genetics. However, depending on the context, you could use these terms:

* Purebred: This term is used more commonly for animals and plants, but it implies the same concept as homozygous - having two identical alleles for a trait.

* Identical genotype: This is a more technical way of saying homozygous, focusing on the genetic makeup rather than the breeding history.

* Having two identical alleles: This is a more literal description of the homozygous condition.

* True-breeding: This term is used when describing organisms that consistently produce offspring with the same traits, which is a result of being homozygous for the relevant genes.

Ultimately, the best alternative depends on the specific context of your writing.