| Dividing chromosomes can be labelled with a thymine analogue, bromodeoxy - uridine. After differential staining, the chromosomes can be seen as darkly stained (old) strands and lightly stained (new) strands. The following chromosomes were observed and photographed while studying division of human blood cells. |
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| From the picture, which of the following can be deduced? |
| [A] The chromosomes belong to metaphase stage. |
| [B] The cell division was taking place in mature red blood cells. |
| [C] Parts of the chromatids were exchanged by crossing over. |
| [D] The different colours of the two sister chromatids confirm that DNA replication is semi-conservative. |
A) [A], [B] and [D]
B) [B] and [D]
C) [A] and [D]
D) [A], [B] and [C]
Correct Answer: B
Solution :
[b] Red blood cells at maturity are enucleated so they cannot undergo any cell division.
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