Cell division

SQA questions

What you should know• Cell division is a means of i_________ the

number of c____ in an organism

• Nucleus of the cell controls c___ a______, including c____ d_______

• E___ of the t___ cells produced by cell division has a complete set of c__________ and the s_____ information. This ensures there is no l____ of g______ i________ in the t___ new b____cells

ncreasing

ells

ell ctivities

ell ivision

ach wo

hromosomes ame

oss enetic

nformation wo ody

• Cell division occurs in ____ stages

• Division of the c_________ and division of the nucleus called m_______.

• Before the nucleus divides each chromosome is c_____ so there is a copy chromosome (c_________) for e___ of the two new cells

• The copy chromosomes are held together by a c__________ and are called c__________

two

ytoplasm

itosis

opied

hromatid ach

entromere

hromatids

original chromosome

copy chromosomes

chromatids

centromere

_______ copy chromosomes (chromatids)

_____chromosomes in e____ n___ c____ and ___ chromosomes were in the original p________ b____cell

6

3ach ew ell3

arentody

_______ copy chromosomes (chromatids)

_____chromosomes in e____ n___ c____ and ___ chromosomes were in the original p________ b____ cell

4

2ach ew ell

2arent

ody

_______ copy chromosomes (chromatids)

_____chromosomes in e____ n___ c____ and ___ chromosomes were in the original p________ b______cell

63

ach ew ell3

arentody

_______ copy chromosomes (chromatids)

_____chromosomes in e____ n___ c____ and ___ chromosomes were in the original p________ b_____cell

8 4ach ew ell

4arent

ody

What is the correct order?

X W Y U V

What is the correct order?

U Y W V X

What is the correct order?

B D A E C

What is the correct order?

C B A D E

Describe what is happening

Draw or describe what happens next

1

Nuclear membrane disappears.Chromosomes being copied

Copy chromosomes (chromatids ) appear

Describe what is happening

Draw or describe what happens next

What type of cell is this? Animal or plant Animal

Cytoplasm dividing by tucking in.

Two cells are formed

Copy chromosomes (chromatids) have formed 4

Copy chromosomes (chromatids) line up at the equator of the spindle

Describe what is happening

Draw or describe what happens next

Describe what is happening

What type of cell is this? Animal or plant ?

Plant

New cell wall forms between the two new cells

Describe what is happening

Draw or describe what happens next

Copy chromosomes (chromatids) lined up at the equator of the spindle

Spindle separates the copy chromosomes (chromatids)

Describe what is happening

Draw or describe what happens next

The copy chromosomes (chromatids)are being separated

New nuclear membranes form round copy chromosomes.New cell wall forms

4

mitosis

Chromosomes (chromatids) are being pulled apart to opposite ends of the cell

To make sure there is no loss of genetic information (genes) in the new cells

mitosis

New cell wall developing

Division of cytoplasm

Chromosomes becoming visible

Nuclear membrane breaking down

To make sure there is no loss of genetic information (genes) in the new cells