Mitotic Cell Cycle Binary Fission Mitotic Cell Cycle

Mitotic Cell Cycle

Binary Fission

Mitotic Cell Cycle

Interphase • DNA replicates during S period.

Replication: The difference between homologous chromosomes and sister chromatids

Phases of Mitosis

Prophase • Chromosomes coil, condense, shorten, and become visible. • Spindle forms.

Prometaphase • Nuclear envelope disappears. • Nucleolus disappears too.

Metaphase • The spindle microtubules align the chromosomes in the middle of the spindle.

Anaphase • The centromeres divide and the microtubules pull the chromatids apart toward opposite poles.

Early Telophase • The chromosome arrive at opposite poles, uncoil and elongate. • Spindle disappears.

Late Telophase • Nuclear membrane forms around each set of chromosomes. • Nucleolus reappears.

The Resulting Daughter Cells • Are genetically identical, each with the same chromosome number as the parent cell.

Cytokinesis in Animal Cells: occurs by actin filaments pinching the cell in two

Cytokinesis in Plant Cells: a new cell wall is laid down to divide the two daughter cells

Question 1 • In mitosis, if a parent cell has 24 chromosomes, each daughter cell will have how many chromosomes? • A. 48 • B. 72 • C. 12 • D. 24 • E. 6

Question 2 • • What happens during anaphase of mitosis? A. chromosomes condense. B. chromosomes align on the cell equator. C. chromosomes are pulled apart by spindle fibers. • D. cells split in two. • E. none of the above.

Question 3 • Chromosomes are duplicated during which period? • A. metaphase. • B. G 1 period. • C. S period. • D. anaphase. • E. G 2 period.

Answers • Question 1: D • Question 2: C • Question 3: C