Q4 of 43 Page 52

A cell has 32 chromosomes. It undergoes mitotic division. What will be the chromosome number (N) during metaphase? What would be the DNA content (C) during anaphase?

Both N and C will be 32.

This is due the fact that DNA is replicated during S phase, after that it would remain the same during equational division.


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2

Mitochondria and plastids have their own DNA (genetic material). What is known about their fate during nuclear division like mitosis?

 3

Label the diagram and also determine the stage at which this structure is visible.

 5

While examining the mitotic stage in a tissue, one finds some cells with 16 chromosomes and some with 32 chromosomes. What possible reasons could you assign to this difference in chromosome number. Do you think cells with 16 chromosomes could have arisen from cells with 32 chromosomes or vice versa?

 6

The following events occur during the various phases of the cell cycle, Name the phase against each of the events.

a. Disintegration of nuclear membrane _________________________


b. Appearance of nucleolus _________________________


c. Division of centromere _________________________


d. Replication of DNA _________________________