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What is the difference between a recessive and dominant allele?

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 for brown eyes or a...
EJ
Answered by Elisha J. • Biology tutor
14599 Views

Why does the bromine become polarised in HBr during electrophilic addition

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 negativ...
RC
Answered by Richard C. • Chemistry tutor
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Compare and contrast...

'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 graspe...
JC
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How does writing reflect the audiences and purposes for which it was intended ?

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. Sorry x" 2) To persuade: &quo...
ES
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How could species have evolved from an ancestor such as Archaeopteryx?

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 produ...
HJ
Answered by Heather J. • Biology tutor
8978 Views