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Alleles are different versions of a gene. Every person has two alleles for each gene (one from either parent). For example, the gene which determines eye colour can either have an allele ...

A C to C double bond has a high electron density. As the bromine gets close to the C=C bond the high electron density repels the electrons in the H-Br bond further towards the H making the H slightly n...

'Compare and contrast' is the opening to a great many literature questions, from GCSE right through to degree. At A level you'll be expected to not only discern the difference but demonstrate you have ...

An audience is the group of people the writer is addressing. 

There are 3 main purposes for writing: (examples in text messages)

1) To inform: "not coming over tonight....

When the population of a species is separated, each group is put under different selection pressures due to differing environments. In each population there is genetic variation, and more offspring are...