Cell Division

Question 1

What does the G1 checkpoint check for?

Answer 1

• Cell size
• Nutrients
• Growth factors
• DNA damage

Question 2

What are the six stages of mitosis?

Answer 2

• Mitosis
• Cytokinesis
• G1
• S
• G2
  G0

Question 3

What does the G2 checkpoint check for?

Answer 3

• Cell size
• DNA replication
• DNA damage

Question 4

What does the M checkpoint check for?

Answer 4

• Chromosome attachment to spindle

Question 5

What happens in the G1 phase?

Answer 5

• Cell growth
• Protein synthesis
• Organelle replication

Question 6

What happens in the S phase?

Answer 6

• DNA synthesis/replication

Question 7

What happens in the G2 phase?

Answer 7

• Cell growth
• Energy stores increased
• Duplicated DNA is checked for errors

Question 8

What are some reasons a cell would enter G0?

Answer 8

• Differentiation
• DNA damage

Question 9

Why do we need mitosis?

Answer 9

• Growth
• Replacement and repair of tissues
• Asexual reproduction

Question 10

Explain Mitosis:

Question 11

What happens instead of cleavage in cytokinesis in plants?

Answer 11

• Vesicles produced by the Golgi apparatus line up along the metaphase plate, fusing with each other and the cell surface membrane

Question 12

Explain Meiosis.

Question 13

Where can variation occur in meiosis?

Question 14

Compare Meiosis 1 and Meiosis 2

Answer 14

• Interphase in Meiosis 1 but not Meiosis 2
• Crossing over in Meiosis 1 but not Meiosis 2
• 2 Haploid cells in Meiosis 1 but 4 Haploid cells in Meiosis 2
• Homologous chromosomes separate in Meiosis 1 however in Meiosis 2, sister chromatids separate