Biology

The correct answer is: A.Chromosomes form and the nuclear envelope disappears.

In prophase of mitosis, the following events occur:

1.Chromosomes condense: The chromatin (the uncondensed form of DNA) begins to coil and condense into visible chromosomes, each consisting of two sister chromatids.

2.Nuclear envelope disappears: The nuclear membrane breaks down, allowing the spindle fibers to interact with the chromosomes.

3.Mitotic spindle begins to form: Spindle fibers begin to form from the centrosomes, which are organizing centers for the microtubules.

Here’s why the other options are incorrect:<...