Q1.  Describe what happens in each of the three stages of the cell cycle.
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(5)
Mark schemes
     stage 1
cell growth
or
increase in number of organelles
allow increase in named organelle e.g. ribosomes / mitochondria
1
DNA replicates*
or
two copies of each chromosome form*
*allow DNA duplicates / doubles
*ignore genetic information replicates
*if this statement given as part of stage 2 allow max 4 marks
1
stage 2 / mitosis
one set of chromosomes moves to each end of cell
allow chromosomes separate or are pulled apart
1
nucleus divides
allow nucleus splits into two
1
stage 3
cytoplasm / cell membrane divides to form two (genetically) identical cells
allow cytokinesis
1
max 4 if correct sequence but no reference to stage numbers
max 4 marks if no stage numbers given
ignore names of phases
marks can be awarded for labelled diagrams
[5]