Stages Of Mitosis

Question 1

Gene

Answer 1

• Is a section of DNA which is involved in carrying information for a particular trait such as eye color, hair color, etc.
• There are about 29 to 30 thousands of genes in every cell of the human body.

Question 2

Chromosome

Answer 2

• a chain of DNA that has been made compact enough to fit into a cell

Question 3

Chromatin

Answer 3

• Is the unravelled condensed structure of DNA that will condense and thicken to form chromosomes before cell division

Question 4

Centromere

Answer 4

• The centre of the chromosome

Question 5

Chromatid

Answer 5

One side of a chromosome

Question 6

Stages of Interphase

Answer 6

G1- the cell produces new proteins and organelles
S- the cell makes an entire copy of the DNA of the cell and ke proteins are produces
G2- the cell produces the organelles and structures needed for cell division

Question 7

What happens during interphase

Answer 7

• The cell is growing and taking in nutrients
• The cell spends most of its time in this phase
• After this stage the cell is ready for mitosis

Question 8

What happens during prophase

Answer 8

• The chromatin condenses into chromosomes
• Nuclear membrane breaks down
• The centrioles move to opposite poles
• The spindle fibres form and attach to the chromosomes at the centromere and to the centrioles on the other end if an animal cell. Spindle fibres attached to the cell wall if it is a plant cell.

Question 9

What happens during metaphase

Answer 9

• The spindle fibres move the chromosomes toward the middle of the cell and line them up

Question 10

What happens in Anaphase

Answer 10

• The spindle fibres contract and shorten and pull the sister chromatids apart at the centromere
• The spindle fibres pull the chromatids to each end of the cell (the poles)

Question 11

What happens in Telephase

Answer 11

• The chromatids reach the poles and the cell membrane pinches inward, eventually splitting the one cell into two cells
• The nuclei in each new cell reforms
• The spindle fibres disappear
• In plant cells, a cell plate forms the cell wall and inner cell membrane in each of the new cells
• Each new cell is now in interphase and the cell starts again

Question 12

Which phase lasts the longest

Answer 12

Interphase

Question 13

What are spindle fibres

Answer 13

• Moves chromosomes around the cell
• They attach to centrioles in animal cells and the cell wall in plant cells
• They form in prophase

Question 14

Difference between animal and plant cell mitosis

Answer 14

1. Spindle fibres attach to centrioles in animal cells and and attach to the cell wall in plant cells
2. When animal cells divide they pinch in but when plant cells divide they create a cell plate