cell division

Question 1

what is the cell cycle?

Answer 1

our body making new cells for growth and to replace damaged cells

Question 2

what are the three main stages in the cell cycle?

Answer 2

interphase, mitosis and Cytokenesis

Question 3

explain the three stages in interphase?

Answer 3

g1 - cell growth and normal function occurs here. (Organelles replicated here)

synthesis- dna replication occurs, each length of DNA forms a pair of strands which are identical and there is a build up of ATP stores

g2 - growth and checkpoint phase. Replication of centrioles (checks and repairs damage to DNA)

Question 4

explain what happens in interphase?

Answer 4

• first part of interphase, the cell grows and organelles are replicated.
• Then DNA is replicated.
• each length of DNA forms a pair of strands. these strands are identical and are called sister chromatids.
• they are joined at the centromere

Question 5

what is mitosis?

Answer 5

cell division that produces 2 genetically identical daughter cells

Question 6

what are the phases in mitosis?
Describe what happens in each stage?

Answer 6

Prophase - chromatin condenses into chromosomes, becoming more visible. centrioles duplicate and and move to opposite poles. centrioles form spindle fibres. the nuclear envelope begins to disintegrate

Metaphase - chromosomes line up along the equator of the cells. Spindle fibres attach to the centromere

Anaphase - the Spindle fibres begin to contract. sister chromatids are pulled to opposite poles of the cell by spindle fibres

Telophase - chromatids have separated now are chromosomes. the nuclear envelope reforms around each set of daughter chromosomes

Question 7

what happens in Cytokenesis?

Answer 7

the cytoplasm divides . both daughter cells that are formed are diploid

Question 8

FINISH