Question

Study the diagram given alongside which represents a stage during the mitotic cell division and answer the questions that follow:

1. Identify the stage giving suitable reasons.
2. Name the parts numbered 1 and 2.
3. What is the technical term for the division of nucleus?
4. Mention the stage that comes before the stage shown in the diagram. Draw a neat labelled diagram of the stage mentioned.
5. Which is the cell division that results in half the number of chromosomes in daughter cells?

Answer 1

1. The stage shown in the diagram is telophase. The nuclear membrane (envelope) and nucleolus are reappearing around each set of chromosomes at opposite poles. The chromosomes have reached the poles and are starting to uncoil into a loose chromatin network. A distinct cleavage furrow/constriction has formed in the plasma membrane, showing that cytoplasmic division has commenced.
2. 1: Chromatin fibre (or Daughter chromosome/Chromatid)
   2: Nuclear membrane
   
3. Karyokinesis
4. The stage before telophase is anaphase.
   
5. Meiosis (also known as reduction division).