Top answers

If a gene mutation is associated with the development of Alzheimer's Disease (e.g. E280A), how might a high frequency develop in a population and why wouldn't natural selection decrease it?

A high frequency of mutation can be produced by having a small population, leading to high levels of inbreeding. When there is little interbreeding with different populations, the genetic diversity will rema...
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Answered by Caitlin R. • Biology tutor
2994 Views

What is the difference between a contractionary and expansionary fiscal policy?

First of all, it is important to understand what a fiscal policy really is. This is a tool used by the government to influence the aggregate demand of the economy and consequently, the total output produced ...
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Answered by Leonor F. • Economics tutor
26361 Views

How to factorise equations, or expand factorised equations?

Factorising x 2 -100: As there is no common element in x 2 or 100, we know this must consist of two sets of brackets not just one. we know both brackets must contain and x, and that which ever two numbers mu...
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Answered by Harleen H. • Maths tutor
3529 Views

How can DNA mutations alter the structure of a protein?

Regions of an organism's genome that code for proteins are known as genes. The sequence of deoxyribonucleic acids (bases) in a gene directly translates to the sequence of amino acids in the protein it encode...
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Answered by Lewis B. • Biology tutor
4030 Views

What should be in my personal statement?

A personal statement is much like the cover letter of a CV; it's a small piece of introductory writing at the top of a CV that is personalised to the position you are applying for. This means that, for the m...
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2292 Views