2.6.2 The Stages of Mitosis

Question 1

Stages of mitosis

Answer 1

• Prophase
• Metaphase
• Anaphase
• Telophase

Question 2

Prophase

Answer 2

• Chromosomes condense (wind tightly around histones)
• Centromere connects 2 chromatids
• 2 Centrosomes replicated in G2 move to opposite poles of nucleus
• Nuclear membrane breaks down

Question 3

Metaphase

Answer 3

• Centrosomes reach opposite poles
• Spindle fibres extend from centrosomes to attach to centromeres
• Chromosomes align at equator

Question 4

Anaphase

Answer 4

• Sister chromatids separate at centromere
• Spindle fibres shorten
• Chromatids pulled to opposite poles by spindle fibres

Question 5

Telophase

Answer 5

• Chromosomes arrive at opposite poles
• Decondense
• Nuclear envelope reforms around each set of chromosomes
• Spindle fibres break down
• New nuclei formed within each nucleus

Question 6

Cytokenesis

Answer 6

• Whole cell divides
• Cytoplasm between 2 nuclei constructs
• 2 genetically identical daughter cells produced