Cell Division

Question 1

Cell Cycle Stages(Mitosis)

Answer 1

Interphase
- G1 Phase
- S Phase
- G2 Phase
Mitosis
- Prophase
- Metaphase
- Anaphase
- Telophase
Cytokinesis

Question 2

3 Functions of Cell Division

Answer 2

Growth - growth of organisms
Repair - repair if tissue and organisms
Maintenance - replace dead if dying cells

Question 3

Occurrences in Interphase

Answer 3

Growth 1
- manor period of growth, cell synthesize new molecules
- centrosomes are duplicated
- needed to direct movement of chromosomes
Synthesis Phase
- DNA(in chromatin form) is replicated
- 2 copies of every chromosome
Growth 2 Phase
- the cell synthesizes more molecules prior to mitosis

Question 4

Occurrences in Prophase

Answer 4

• Chromatins shorten and thicken into chromosomes
• Each chromosome = two copies of one chromosome
• sister chromatids are joined together at the centromere
• centrosomes separate and move to opposite poles and leave microtubules which will become spindle fibres

Question 5

Occurrences in Metaphase

Answer 5

• The spindle fibers guide the chromosomes to the equator of the cell
• Centromeres are aligned across the middle of the cell
• Spindle fibers from opposite poles attach to the centromere of each centrosome

Question 6

Occurrences in Anaphase

Answer 6

• The chromosomes divide
• Motor proteins pull on each side of centromere
• Centromere splits apart and sister chromatids separate from eachother
• Separated sister chromatids are now called chromosomes
• Spindle fibers shorten pulling the chromosomes to opposite poles

Question 7

Occurrences in Telophase

Answer 7

• The seperated chromosomes reach opposite poles
• Chromosomes unwind into chromatin
• Spindle fibers break down
• Nuclear membrane forms around the nee sets of chromosomes
• A cleavage forms

Question 8

Occurrences in Cytokinesis

Answer 8

• Division of cytoplasm
• 2 New daughter cells(genetically identical)

Question 9

Cell Cycle Stages(Meiosis)

Answer 9

Interphase
- G1 Phase
- S Phase
- G2 Phase
Meiosis I
- Prophase I
- Metaphase I
- Anaphase I
- Telophase I
Cytokinesis 1
Meiosis II
- Prophase II
- Metaphase II
- Anaphase II
- Telophase II
Cytokinesis 2

Question 10

Occurences in Prophase I

Answer 10

• Chromosomes start to shorten and thicken
• Each chromosome was replicated during interphase, and now consists of two sister chromatids joined at the centromere
  Synapsis
  
  • Each pair of homologous chromosomes line up side by side
  • Crossing over(exchange of genetic information)