Mitosis

Question 1

Interphase

Answer 1

• During S phase of interphase, the nucleus replicates its DNA

Question 2

Prophase

Answer 2

• Chromatin coils and super-coils become more and more compact, condensing into chromosomes
• Chromosomes consist of identical, paired sister chromatids
• Spindles begin to form

Question 3

Prometaphase

Answer 3

• nuclear envelope breaks down

- kinetechore microtubules appear and connect to the kinetechore poles

Question 4

Metaphase

Answer 4

• centromeres become aligned into a plane at the cell’s equator

Question 5

Anaphase

Answer 5

• paired sister chromatids separate and new daughter chromosomes begin to move towards the poles

Question 6

Telophase

Answer 6

• daughter chromosomes reach the poles
• as telophase concludes, the nuclear envelopes and necleoli reform
• chromatin begin to diffuse and cell enters interphase again

Question 7

Cytokinesis

Answer 7

• in animals, actin and myosin form a “purse string” that constricts and divides the cell
• in plants, vesicles fuse to make cell membrane and cell plate, which becomes the new cell wall dividing the mother cell
• some cells do not bother to divide their cytoplasm (Ex: muscle cells)