Mitosis

Question 1

what is mitosis?

Answer 1

produces 2 daughter nuclei that have the same number of chromosomes as the parent cell and each other

Question 2

what is mitosis always preceded by and what is the period called?

Answer 2

a period during which the cell is not dividing, called INTERPHASE

Question 3

what happens during interphase?

Answer 3

a period of considerable cellular activity that includes a very important event- the REPLICATION OF DNA

Question 4

what are the four stages mitosis can be divided into?

Answer 4

prophase
metaphase
anaphase
telophase

Question 5

what happens during prophase?

Answer 5

chromosomes become VISABLE
the nuclear envelope disappears
nucleolus disappears

Question 6

what happens during metaphase?

Answer 6

chromosomes arrange themselves at centre of cell

spindles form

Question 7

what happens at anaphase?

Answer 7

spindle fibres attached to chromatids CONTRACT

chromatids are pulled to the poles

Question 8

what happens at telophase?

Answer 8

chromatids reach poles + become indistinct
nuclear envelope reforms
nucleolus reforms
spindle disintegrates

Question 9

how can the stages of mitosis be remembered?

Answer 9

Please Make Another Two

Question 10

what are the three main reasons why mitosis is important?

Answer 10

• GROWTH
• DFFERENTIATION
• REPAIR

Question 11

why is mitosis important for growth?

Answer 11

when two haploid cells fuse together to form a DIPLOID CELL the diploid cell hall all the genetic info needed to form the new organism.

Mitosis ensures all the cells from the parent possess the same set of genetic info

Question 12

why is mitosis important for differentiation?

Answer 12

some cells change to give groups of specialised cells. these different cell types each divide by mitosis so tissues are made up of IDENTICAL CELLS- perform a particular function

Question 13

why is mitosis important for repair?

Answer 13

if cells are damaged/die- important new cells have an identical structure and function to the ones that have been lost
this ensures they function as effectively as before

mitosis is how new cells replace old ones

Question 14

what type of process if mitosis?

Answer 14

continuous

Question 15

when mitosis is viewed under a microscope, how can they tell how long each cell spends undergoing each stage?

Answer 15

the number of cells at each stage of mitosis is PROPORTIONAL TO the time each cell spends undergoing that stge