NEET BIOLOGY

Detailed explanation-1: -Mitosis begins with prophase, during which chromosomes recruit condensin and begin to undergo a condensation process that will continue until metaphase.

Detailed explanation-2: -During prophase, the chromosomes condense and the nucleolus disappears. At the beginning of prophase, the chromosomes are condensing to become visible microscopically. Each chromosome consists of two parallelsister chromatids, joined together at one point along their length at thecentromere.

Detailed explanation-3: -Throughout the process of prophase the chromosomes condense meaning they get shorten and thicken to form visibly distinct threads within the nucleus. This is brought about by the action of large proteins called condensins.

Detailed explanation-4: -During prophase, chromatin condenses into chromosomes, and the nuclear envelope (the membrane surrounding the nucleus) breaks down. In animal cells, the centrioles near the nucleus begin to separate and move to opposite poles of the cell.