Between organisms that have different ploidy(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "interploidy" in a sentence
"Here we investigated gene expression underlying parent-of-origin effects in Arabidopsis through transcriptional profiling of siliques generated by interploidy crosses and FIS-class mutants."
"One interpretation is that interploidy crosses disrupt the balance in the seed of active copies of parentally imprinted genes."