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Cell division is the multiplication of the cells that maintain cell growth and repair in an organism. The cell division process that takes place in the somatic cells creating two diploid daughter cells, is known as mitosis.

Condensations of chromosomes are the folding process that occurs in the mitosis phase. It takes place during the first process of mitosis, known as prophase.

The condensation of the chromosome is the first and foremost step in the mitosis process.

Therefore, the given option is false.

Replication of DNA is the separate process that occurs during the S-phase of the cell cycle. In the mitotic stage, there is a cleavage of the existing cells to produce the daughter cells.

The replication of DNA is not the step of mitosis as it occurs during the synthesis phase of the cell cycle.

Therefore, the given option is true.

The separation of sister chromatids is the process that takes place in the mitotic phase. It is the process that takes place in the anaphase.

The separation phase occurs during the anaphase.

Therefore, the given option is false.

Spindle fibers are a long thread-like structure that extends from the pole of the cells to get attached to the cell structure. The spindle fibers start to develop during the prophase.

The spindle fiber formation comes under mitosis.

Therefore, the given option is false.