Mitotic Cell Cycle Binary Fission Mitotic Cell Cycle.

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Presentation transcript:

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. G1 period. C. S period. D. anaphase. E. G2 period.

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