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Summary Binary fission
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Year 1 Biology AQA A level notes. Achieved an A* in my final exam using these notes. They are based on the mark scheme requirements.
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Binary fission of prokaryotic cells10 October 2022 10:39
Cell division in prokaryotic cells
- They divide by binary fission because they do not have a nucleus, chromosomes, spind
membrane bound organelles so cannot divide by mitosis
Semi conservative replication (occurs both in eukaryotes and prokaryotes)
- Before a parent cell divides it must replicate DNA so daughter cells get full copy of DNA
- In each new DNA molecule produced, one of the polynucleotide DNA strands (half of
DNA molecule) is from the original DNA (parent strand) molecule is being copied
- The other polynucleotide DNA strand (the other half of the new DNA molecule) has to
new by the cell (daughter strand)
In summary, one original DNA strand is retained during semi conservative replication- half
DNA molecule is from the original DNA molecule
- New daughter cell has one parent strand of DNA and one daughter strand of DNA
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