Question

which of the following is the correct order of events in mitosis?○ the kinetochore becomes attached to the mitotic spindle. sister chromatids line up at the metaphase plate. the kinetochore breaks apart and the sister chromatids separate. the nucleus re-forms and the cell divides.○ sister chromatids line up at the metaphase plate. the kinetochore becomes attached to the mitotic spindle. the nucleus re-forms and the cell divides. the sister chromatids separate.○ the kinetochore becomes attached to metaphase plate. sister chromatids line up at the metaphase plate. the kinetochore breaks down and the sister chromatids separate. the nucleus re-forms and the cell divides.○ the kinetochore becomes attached to the mitotic spindle. the sister chromatids separate. sister chromatids line up at the metaphase plate. the nucleus re-forms and the cell divides.

Explanation:

Mitosis proceeds in a fixed sequence: first, kinetochores on sister chromatids attach to the mitotic spindle (prometaphase). Next, sister chromatids align at the metaphase plate (metaphase). Then, the connection holding sister chromatids together breaks, and they separate (anaphase). Finally, the nuclear envelope re-forms and the cell divides (telophase and cytokinesis). Only the first option follows this correct order.

Answer:

The kinetochore becomes attached to the mitotic spindle. Sister chromatids line up at the metaphase plate. The kinetochore breaks apart and the sister chromatids separate. The nucleus re-forms and the cell divides.