AP BIOLOGY

Detailed explanation-1: -Metaphase is the third step in mitosis. In mitosis, mitotic spindle is fully developed, centrosomes are at opposite poles of the cell. chromosomes are lined up at the metaphase plate.

Detailed explanation-2: -The second phase of mitosis is metaphase, in which the chromosomes move into the equatorial plane of the spindle. As the third phase-anaphase-begins, the chromatids separate and move to opposite ends of the cell. Once the chromatids separate, they are called chromosomes.

Detailed explanation-3: -Spindle. A third checkpoint occurs during M phase and is called the spindle checkpoint. As chromosomes condense and attach to the mitotic spindle, sometimes one or more chromosomes fail to attach.

Detailed explanation-4: -Prophase – The chromosomes shorten and thicken. Metaphase – Chromosomes line up in the middle of the cell. Anaphase – Chromatids break apart at the centromere and move to opposite poles. Telophase – Two nuclei formed after nuclear envelopes reform around each group of chromosomes.

Detailed explanation-5: -The cell membrane pinches in and eventually divides into two daughter cells. The stages of mitosis are: prophase, metaphase, anaphase and telophase.