Topic 2 - Cell Division

Question 1

Explain the stages in interphase

Answer 1

G1 = cell grows a new organelles that are and proteins are made

S = cell replicates DNA

G2 = growth and proteins for cell division are made

Question 2

Briefly describe mitosis

Answer 2

The division of cells during the cell cycle to produce two geneticly identical daughter cells

Question 3

Describe the structure of chromosomes in mitosis

Answer 3

Beginning = two strands (chromatids) joined by centromere, two sister chromatids

End = new chromatids end up as one strand chromosomes in the new daughter cells

Question 4

What happens in prophase?

Answer 4

Chromosomes condensed, bundles of centrioles move to opposite ends of the cell forming protein fibres across it (spindle), nuclear envelope breaks down and chromosomes lie free in the cytoplasm

Question 5

What happens in metaphase?

Answer 5

Chromosomes lineup along the middle of the cell and attached to the spindle by their centromeres.

Question 6

What happens in anaphase?

Answer 6

Centrioles divide separately each pair of sister chromatids move to opposite poles of the cell

Question 7

what happens in telophase?

Answer 7

Chromatids reach opposite poles on the spindle, uncoil and become chromosomes, nuclear envelope forms around each group so are now two nuclei, cytoplasm divides, now two genetically identical daughter cells

Question 8

What is mitotic index?

Answer 8

The portion of cells that undergo mitosis