When the m phase begins during the cell cycle, it starts with metaphase anaphase telophase prophase

The correct answer for the blank is-

Prophase.

M phase (mitotic phase) is the second phase of cell cycle (the first being interphase, which contains G1, S, and G2 stages).

In the M phase, the parent cell is divided into two daughter cell (through a sequence of 5 stages in the order- Prophase, metaphase, anaphase, telophase, and cytokinesis). The daughter cells have same number of chromosomes as that of the parent cell.

Prophase marks the beginning of M phase. In this phase, nuclear envelope is broken down and chromatin becomes condensed into visible chromosomes. Mitotic spindle formation is also initiated in this phase.

Thus, prophase is the right answer.

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