Question

The diagram below represents a stage during cell division. Study the same and then answer the questions that follow: 

 

1. Name the parts labelled 1, 2, and 3.
2. Identify the above stage and give a reason to support your answer.
3. Mention where in the body this type of cell division occurs.
4. Name the stage prior to this stage and draw a diagram to represent the same.

Answer 1

1. 1. Centrioles
   2. Spindle fibres
   3. Chromatids
2. Late anaphase is a furrow starting in the cell membrane at the middle of the cell. The stage described in the diagram is the late anaphase of mitosis in an animal cell. It can be identified by the presence of separated chromatids at the cell's two poles. The appearance of the furrow in the cell membrane classifies the stage as the late anaphase.
3. Mitosis occurs in somatic cells (e.g., skin, bone marrow), and meiosis occurs in germ cells within reproductive organs (ovaries and testes).
4. The stage before anaphase is called the metaphase stage. During the metaphase stage, the chromosomes are aligned at the equatorial region of the cell. The spindles arising from the centrioles get attached to the chromosomes at centromeres. The chromosomes are in the most condensed state in this phase. The below diagram shows the metaphase stage of mitosis: