Several organisms,including some diatoms and yeasts,have intermediate mitotic organization.Which of the following is the most probable hypothesis regarding these intermediate forms of cell division?
A)They represent a form of cell reproduction that must have evolved completely separately from that present in most eukaryotes.
B)These species are not closely related other diatoms and yeasts,even though they may be similar in outward appearance.
C)They rely on totally different proteins for the processes they undergo.
D)They show some but not all of the evolutionary steps toward complete mitosis.

Question

Quizplus · Accepted Answer

The question is asking for the most probable hypothesis regarding intermediate mitotic organization. Choice A is unlikely as it suggests that these forms of cell division evolved completely separately, which is highly improbable. Choice B is also unlikely as it suggests that similar forms of cell division evolved independently in unrelated organisms. Choice C is also unlikely as it suggests that completely different proteins are used in these organisms, which is highly unlikely. Choice D is the most probable hypothesis as it suggests that these organisms have undergone some but not all of the steps towards complete mitosis. This would explain why they have intermediate mitotic organization, and also suggest that they may continue to evolve towards complete mitosis in the future.

Several Organisms,including Some Diatoms and Yeasts,have Intermediate Mitotic Organization