Multiple choice Organisms with highest and least number of chromosomes respectively are ___________. Tympanoctomys barrerae and Myrmecia pilosula Myrmecia pilosula and Ophioglossum reticulatum Ophioglossum reticulatum and Myrmecia pilosula Tympanoctomys barrerae and Drosophila melanogaster Ophioglossum reticulatum and Tympanoctomys barrerae Reveal answer Fill a bubble to check yourself C Correct answer Explanation Ophioglossum reticulatum (2n=1260): Highest known number of chromosomes in any life form Myrmecia pilosula (2n=2): 2 for females, males are haploid and thus have one; smallest number of chromosomes among all organisms.