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Slide 1

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Cell division…read more

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The cell cycle
· Animals begin their life as a single cell, a zygote
· Contains one set of chromosomes from your
mum and then one from your dad.
· the repetitive process of growing and dividing,
growing and dividing is called the cell cycle.
· There are two main phases, interphase and
mitosis.…read more

Slide 3

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· One complete cell cycle lasts about 24 hours.
· About 93% of this time is spent in interphase.
· During this time, normal cell activities are taking place.
· Respiration
· Protein synthesis
· The DNA is duplicated
· There are 46 chromosomes in a human cell.
· The DNA that has been duplicated is joined to each other at
the centromere. The two identical strands of DNA are
called chromatids.
· Needs to be careful there are no mutations in the DNA.
· Proteins work along the DNA molecules checking them for
any errors.…read more

Slide 4

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· The stage during which the nucleus of the cell
divides into two nuclei.
· The two chromatids that make up each
chromosome break apart.
· One goes into one nucleus and one goes into
the other
· The new cells will be genetically identical to
each other and to the parent cells.
· There are four parts to mitosis; prophase,
Metaphase, anaphase, telophase.…read more

Slide 5

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· The chromosomes become visible
· The DNA molecules shorten and get thicker.
· The nucleolus disappears.
· The spindle begins to form.
· The centrioles move away from each other to
opposite ends of the cell.
· The centrioles organise the formation of the
microtubules.…read more

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