In which of the following group of organisms chromosomes do not have histone proteins but nuclear membrane and nucleolus remain present even during cell division?

Ceratium and Gymnodinium

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Navicula and Melosira

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Dictyostellium and Physarum

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Xanthomonas and Pseudomonas

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Solution

The correct option is A Ceratium and Gymnodinium
Ceratium and Gymnodinium are Algae. These belong to the family Dinoflagellates and they lack histone proteins.The chromosome are not scattered and they are attached to nuclear membrane. Even during the mitosis and interphase, the chromosomes remain condensed.The nuclear membrane also does not break during cell division and a spindle of microtubules is formed.
So, the correct option is 'Ceratium and Gymnodium'.

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Similar questions

In which phase do the nuclear membrane and nucleolus disappear?

Identify the stage of Mitosis by inspecting the image and key changes listed.

Key changes:

* Nucleolus and nuclear membrane disappear.

* Organelles disappear, formation of chromosomes.

* Centrioles organize to form spindle fibres.

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