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Which stages of cell division do the following figures A and B represent respectively?
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A
Fig. A: Prophase — Fig. B: Anaphase
B
Fig. A: Metaphase — Fig. B: Telophase
C
Fig. A: Telophase — Fig. B: Metaphase
D
Fig. A: Late Anaphase — Fig. B: Prophase
Detailed Solution
Figure A shows two groups of daughter chromosomes that have moved apart and reached the opposite poles of the cell, with the cell still undivided; this is late anaphase.
In anaphase the centromeres split and the chromatids, now daughter chromosomes, migrate to the opposite poles with their centromeres leading.
Figure B shows condensing chromosomes within the nucleus and the centrioles (asters) beginning to move apart towards opposite poles; this is prophase.
It is not metaphase, because the chromosomes are not aligned on the equatorial plate, and not telophase, because no nuclear envelopes have reformed.
Hence A is late anaphase and B is prophase.
In anaphase the centromeres split and the chromatids, now daughter chromosomes, migrate to the opposite poles with their centromeres leading.
Figure B shows condensing chromosomes within the nucleus and the centrioles (asters) beginning to move apart towards opposite poles; this is prophase.
It is not metaphase, because the chromosomes are not aligned on the equatorial plate, and not telophase, because no nuclear envelopes have reformed.
Hence A is late anaphase and B is prophase.