Mitosis

Question 1

Why is mitosis important

Answer 1

Growth of multi cellular organisms

Repairing damaged tissues

Question 2

Stages of mitosis

Answer 2

Interphase

Prophase
Metaphase
Anaphase
Telophase

Cytokinesis

(PMAT)

Question 3

Interphase

Answer 3

• Chromosomes replicated
• sister chromosomes turn into sister chromatids

ATP INCREASED

BEFORE MITOSIS

Question 4

Prophase

Answer 4

• chromosomes condense- shorter and fatter
• centrioles start moving to opposite ends of cell
• forms network of protein fibres across spindle
• nuclear envelope breaks down – chromosomes lie free in cytoplasm

Question 5

Metaphase

Answer 5

• Chromosomes line up along equator
• become attached to spindle equator by their centromere

M checkpoint : cell checks all chromosomes are attached to spindle

Question 6

Anaphase

Answer 6

• Centromeres divide, separating each pair of sister chromatids
• spindles contract, pulling chromatids to opposite end of cell, centromere first

Question 7

Telophase

Answer 7

• chromatids reach opposite poles on spindle
• uncoil, become long and thin– become chromosomes
• nuclear envelope forms around each group of chromosomes - there are now 2 nuclei

Question 8

Cytokinesis

Answer 8

SEPEARATE FROM MITOSIS

BEGINS IN ANAPHASE, ENDS IN TELOPHASE

• cytoplasm divides, cleavage furrow form to divide cell membrane
• now two daughter cells that are genetically identical to eachother