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Edexcel A Level Biology Paper 3 Mark scheme June 2022: (9BI0) Paper 3 | General and Practical Principles in Biology

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Edexcel A Level Biology Paper 3 Mark scheme June 2022: (9BI0) Paper 3 | General and Practical Principles in Biology. A description that includes four of the following: • obtain DNA (from the two types of plants) (1) • use of {restriction enzymes / endonuclease} to cut DNA into fragments (1) • {DNA / fragments} (loaded) on (agarose) gel with {current passed through / voltage or potential difference applied} (1) • fragments (of DNA) are separated (1) • {same / similar} (banding) pattern suggests they are the same species (1) Accept use of PCR to amplify DNA Accept use of {taq / DNA} polymerase to sequence DNA Accept movement of (negatively charged) DNA moves to positive electrode Accept description / diagram of banding pattern Accept shorter fragments travel further Accept converse Accept {same / similar} sequence suggests they are the same species (4) Question Number Answer Additional Guidance Mark 6(b)(ii) An explanation that includes two of the following: • (if leaf is green it contains) chlorophyll / photosynthetic pigments (1) • so more light absorbed for photosynthesis (1) • so more glucose produced for growth (1) OR • (if flower is brightly coloured) it attracts {pollinators / insects} (1) • so (more likely to) reproduce (successfully) (1) • to produce seeds / pass trait on (1) Accept more wavelengths of light absorbed for photosynthesis Accept more light absorbed leads to higher rate of photosynthesis Accept more GALP / TP / GP for growth Accept so increased genetic variation (as less selfpollination)

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Uploaded on
May 15, 2023
Number of pages
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Written in
2022/2023
Type
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  • edexcel a

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Edexcel A Level Biology Paper 3
Mark scheme June 2022: (9BI0)
Paper 3: General and Practical
Principles in Biology

,Mark Scheme (Results)

Summer 2022

Pearson Edexcel GCE
In Biology (9BI0)
Paper 3: General and Practical Principles in Biology

,Edexcel and BTEC Qualifications

Edexcel and BTEC qualifications are awarded by Pearson, the UK’s largest awarding body. We provide
a wide range of qualifications including academic, vocational, occupational and specific programmes
for employers. For further information visit our qualifications websites at www.edexcel.com or
www.btec.co.uk. Alternatively, you can get in touch with us using the details on our contact us page
at www.edexcel.com/contactus.




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, General Marking Guidance



• All candidates must receive the same treatment. Examiners
must mark the first candidate in exactly the same way as they
mark the last.
• Mark schemes should be applied positively. Candidates must
be rewarded for what they have shown they can do rather
than penalised for omissions.
• Examiners should mark according to the mark scheme not
according to their perception of where the grade boundaries
may lie.
• There is no ceiling on achievement. All marks on the mark
scheme should be used appropriately.
• All the marks on the mark scheme are designed to be
awarded. Examiners should always award full marks if
deserved, i.e. if the answer matches the mark
scheme. Examiners should also be prepared to award zero
marks if the candidate’s response is not worthy of credit
according to the mark scheme.
• Where some judgement is required, mark schemes will
provide the principles by which marks will be awarded and
exemplification may be limited.
• When examiners are in doubt regarding the application of
the mark scheme to a candidate’s response, the team leader
must be consulted.
• Crossed out work should be marked UNLESS the candidate
has replaced it with an alternative response.

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