"Heteroplastide" is a term often used in biology, specifically in reference to the phenomenon of heteroplasmy. Heteroplasmy describes the presence of multiple types of genetic material, typically within the mitochondria of an organism. While there may not be synonyms that directly replace the term "heteroplastide", one can use alternative phrases to describe this concept. Terms like "mixed genetic material", "genetic variability" or "mitochondrial heterogeneity" can all be used to convey the idea of heteroplasmy. These synonyms help to highlight the diversity of genetic information present within an organism's mitochondria, which can have important implications for disease susceptibility and evolutionary processes.