Cell Division

Question 1

What type of cell division is mitosis responsible for?

Answer 1

Growth and repair

Question 2

What type of cell division is meiosis responsible for?

Answer 2

Reproduction

Question 3

What do both mitosis and meiosis involve?

Answer 3

Both involve division of the nucleus and
division of the cytoplasm

Question 4

When do the chromosomes become visible?

Answer 4

By the end of prophase

Question 5

Each half of a double stranded chromosome
is called a…

Answer 5

Chromatid

Question 6

What happens during interphase?

Answer 6

Preparatory stage

•Nucleus is present
•Chromosomes not visible - each one is being copied

Organelles are being formed to support two
new cells

Question 7

What happens during prophase?

Answer 7

Spindle fibres start to form
The nuclear membrane & nucleolus start to disappear
Chromosomes appear threadlike and then condense to form double stranded chromosomes

Question 8

What happens during metaphase?

Answer 8

•The chromosomes line up at the equator of the cell

•The centromeres attach to the spindle

Question 9

What happens during anaphase?

Answer 9

•Centromeres split
•One half of each double stranded chromosome moves to one end of the cell with the centromeres leading
•By late anaphase the chromosomes reach the poles of the cell
•The cytoplasm starts to divide

Question 10

What happens during telophase?

Answer 10

Cytoplasm finishes dividing
•Chromosomes fade from view
•The nuclear membrane and nucleoli form
•The spindle disappears
•A second centriole forms in each cell
•“opposite to prophase”
•There are now two cells identical to the parent cell

Question 11

What are the differences between mitosis and meiosis?

Answer 11

MITOSIS results in two cells that are genetically identical to original parent cell

MEIOSIS results in a genetically different cell to the parent cell.

Question 12

How many times does the nucleus and cytoplasm divide during meiosis?

Answer 12

Twice

Question 13

What happens during the first stage of meiotic division?

Answer 13

During the first meiotic division the pairs of chromosomes become single chromosomes

Question 14

What happens during the second stage of meiotic division?

Answer 14

During the second meiotic division the double - stranded chromosomes become single – stranded chromosomes

Question 15

How many cells are produced at the end of meiotic division?

Answer 15

Four

Question 16

What stage results in genetically different cells in meiosis?

Answer 16

The “crossing over” during prophase I of meiosis

Question 17

What are the stages of mitosis in order?

Answer 17

Interphase
Prophase
Metaphase
Anaphase
Telophase