Some cell have several nuclei within their cytoplasm. considering the events in a typical cycle, which phase is not operating when such cells form? i

The second and last phase which is cytokinesis is missing in the cell cycle.

A cell division into two daughter cell involves two phases:

Karyokinesis: The division of the cell nucleus. It further involves many steps like prophase interphase metaphase etc. After this phase cell contains two daughter nuclei.

Cytokinesis: This the division of the cytoplasm of the cell and having the formation of a cell membrane in the middle of the cell separating two daughter nuclei into two distinct cells.

If karyokinesis proceeds but cytokinesis does not proceed. It leads to the multinucleated cell.

answer; i believe that the correct answer is (lung);

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

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