Question

When are chromosomes visible in a cell ?

Answer 1

 only during cell division 
(or to be more specific, between late prophase and early telophase) 

the chromatin condenses into chromosomes during this time, making it visible.

Answer 2

Answer:

prophase

During interphase (1), chromatin is in its least condensed state and appears loosely distributed throughout the nucleus. Chromatin condensation begins during prophase (2) and chromosomes become visible.

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