Identify the phase of mitosis and structure labelled as X in the image given below.

Metaphase, spindle fibre

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Anaphase, centriole

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Metaphase, centriole

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Prophase, centriole

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Solution

The correct option is B Anaphase, centriole
In the given image, it is clearly visible that the sister chromatids are moving to opposite poles. This occurs during anaphase.

Prophase - Chromatin condensation forming chromosomes.
Metaphase - Chromosomes align in the centre of the cell.
Anaphase - Sister chromatids separate and move to opposite poles.
Telophase - Two nuclei are formed, chromosomes decondense to form chromatin.

The structure labelled as X in the diagram are centrioles. The spindle fibres composed of microtubules arise from centrioles. Centrioles also organize the microtubules so that they get attached to the chromosomes. Hence, centrioles are called MTOC (microtubule organising apparatus).

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Similar questions

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

Key changes:

- nucleolus and nuclear membrane disappears

- organelles disappear, chromosomes are formed

- centrioles organize to form spindle fibres.

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

Key changes:

* Nucleolus and nuclear membrane disappears.

* Organelles disappear, formation of chromosomes.

* Centrioles organise to form spindle fibres.

As spindle fibres are formed by centrioles during mitosis. But they are absent in plant cells. So who forms spindle fibres in plants in order to carry out mitosis.

-Uby. H

Identify the stage of Mitosis by the image and key changes in the process.

Key changes:

* Spindle fibres disappear.

* Cell membrane completes constriction.

* Nuclear membrane reappears.

* Cytokinesis follows.

Q. State the following statements are true or false.
In mitosis, all chromosomes become aligned at the spindle equator at the end of anaphase

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