Prophase mitosis

Question 1

What happens to chromosomes in prophase

Answer 1

Chromosomes condense and are now visible when stained

Question 2

The chromosomes consist of …………….

that are joined together at the ………………

Answer 2

The chromosomes consist of two identical chromatids called sister chromatids (each containing one DNA molecule) that are joined together at the centromere

Question 3

centromere meaning

and how is it visible

Answer 3

Is the place where two copies of DNA(after replication has occurred) join together and site of attachment of spindle fibres

its is visible as a construction in the chromosomes

Question 4

The two centrosomes (replicated in the G2 phase just before prophase) move towards

Answer 4

opposite poles (opposite ends of the nucleus)

Question 5

?

Answer 5

the centrosomes (consists of two centrioles in animal cells)

Question 6

The nuclear envelope (nuclear membrane) ……… down into ………….

Answer 6

breaks

small vesicles

Question 7

What is a centrosome

and do plants have it

Answer 7

An organelle found in animal cells that acts as the microtubule organising of centre and is responsible for forming spindle fibres]

Plants mitosis occurs without centrosomes

Question 8

Centrioles are made up

Answer 8

made up of microtubules. Centrioles consist of small, hollow cylindrical proteins called microtubules.

Question 9

Centrioles help chromosomes separate during cell division. During cell division, it is vital that chromosomes are equally separated so that each of the daughter cells will have the same number of chromosomes.

Centrioles ensure this happens by

Answer 9

pulling the chromosomes apart equally to each end of the dividing cell.

Question 10

Spindle fibres have formed