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What is the difference between a gene and an allele?

A gene is a section of DNA or RNA that codes for a protein. Alleles are different versions of the gene. For example, if a gene coding for a particular enzyme mutated, then there would be two alleles of the g...
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Answered by Ellen P. • Biology tutor
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How do I revise novels my English Literature GCSE exam?

Firstly, make sure that you understand and can remember the plot of the book. If you have not made summarising notes throughout the year, do not worry. Although your personal notes are better as they are mor...
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Why can longitudinal studies be problematic?

Longitudinal studies are those which are carried out over a long period of time. Longitudinal studies can be problematic because, over time, participants may drop out. This is an issue because it leaves the ...
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Answered by Hannah N. • Psychology tutor
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How should I approach source questions in the exam?

That depends an awful lot on the question itself. Source questions can seem really scary, especially if you haven’t seen the source before, but there are a few little tricks which make it a lot more manageab...
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Answered by Hannah N. • History tutor
3889 Views

Why is it important to look at who wrote a source that I want to use for my coursework?

It is vital that you look at who wrote both primary and secondary sources. You probably know from GCSE that primary sources may be heavily influenced by all manner of characteristics belonging to the author....
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Answered by Hannah N. • History tutor
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