mitosis stages

Question 1

what happens during interphase

Answer 1

-cell is not dividing
-chromatin not visible
-DNA, histone, centrioles replicated
-replication of cell organelles

Question 2

whats a histone

Answer 2

-protein in which DNA wraps itself around to condense

Question 3

what happens during prophase

Answer 3

-chromosomes have replicated
-nucleur envelope breaks down
-centriole divides and 2 daughter centrioles move to opposite poles
-cytoskeleton protein threads form spindle between centrioles
-chromosomes shorten and thicken

Question 3

what happens during metaphase

Answer 3

-the pairs of chromatids attatch to spindle threads at equator region
-attach by centrioles

Question 4

what happens during anaphase

Answer 4

-the centromere of each pair of chromosomes splits
-motor proteins (along tubulin threads) pull each sister chromatid of a pair in opposite directions to poles
-because centromere goes first, chromatids assume a V shape

Question 5

whats a centrosome

Answer 5

-organelle located near nucleus in animal cells
-contains pair of centrioles and is responsible for organizing mitotic spindle

Question 6

what happens during telophase

Answer 6

-separated chromosomes reach the poles
-a new nucleur envelope forms around each set of chromosomes
-cell contains 2 nuclei each genetically identical to each other and parent cell which arose

Question 7

what happens during cytokenisis

Answer 7

-plasma membrane folds inwards and “nips in” the cytoplasm
-in plant cells, end plate forms where equator was and new plasma membrane + cellulose wall material are laid down on either side