The chromosomes become visible under a light microscope during which stage of mitosis?
prophase
prometaphase
metaphase
anaphase

The chromosomes become visible under a light microscope during prophase stage of mitosis

Explanation:

Propohase -

The first phase of mitosis , in which the chromosomes becomes visible , as a distinct structure , the nuclear envelope breaks down and the spindle formation takes place .

Hence , this stage is visible under the light microscope.

The next phase is the metaphase , in which the chromosomes line up in middle of cell .

In the third phase , i.e. , the anaphase , the chromosomes moves towards the opposite sides of the vcell .

In the fourth phase , i.e. , the telophase , the two nuclei are formed .

In the last stage , i.e. , cytokinesis , the cell finally divides into two daughter cells .

you know they are heterozygous for a trait because they have it as jj or jj.