Conjoined sister chromatids become visible under a light microscope at a diameter of about:
AOne nanometre
BTen nanometres
COne micrometre
DOne millimetre
Answer & Solution
Correct answer: C. One micrometre
1. Compaction proceeds through several levels, each thicker than the last.
2. The nucleosome beads are about 10 nanometres and the chromatin fibre about 30 nanometres.
3. The conjoined sister chromatids, with a diameter of about 1 micrometre, are visible under a light microscope.
4. Ten nanometres is the nucleosome figure, so that option belongs to an earlier stage of packing.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 10 'Cell Reproduction', sections 10.1-10.5_
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