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What is the difference between genotype and phenotype?

In genetics, traits such as eye colour, sex and skin colour are carried in genes. Taking eye colour as an example, you will have a gene located somewhere within a chromosome encoding for eye colour. This gen...
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Answered by Andrea D. • Biology tutor
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How do you accentuate words in spanish?

Accentuation works by following a set of rules which varies according to which syllable is the strong one when you prounounce it. There are three types of classification. The first one is called "Esdrúj...
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Answered by Andrea D. • Spanish tutor
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How does perfect tense work in French?

In French, to talk in the past about an event, a precise action (that didn't last), we use the perfect tense. It is basically formed using two components : an auxiliary verb and a past participle. There are ...
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Answered by Virgile T. • French tutor
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Show that if a polynomial with integer coefficients has a rational root, then the rational root must be an integer. Hence, show that x^n-5x+7=0 has no rational roots.

Let f(x)=x^n+a_(n-1)x^(n-1)+...+a_0 with n>=2 and a_i an integer have a rational root x=p/q. Consider q^(n-1)f(p/q). q^(n-1)f(p/q)=p^n/q+a_(n-1)p^(n-1)+...+a_0q^(n-1)=0 ==> a_(n-1)p^(n-1)+...+a_0q^(n-1...
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Answered by Peter A. • STEP tutor
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How to differentiate tan(x)?

tanx = sinx/cosx. Express this as: sinx*(cosx)^-1. Remembering the product rule: "y = f(x)g(x), dy/dx = f'(x)g(x) + f(x)g'(x)". sinx differentiates to cosx and cosx differentiates to -sinx. Also, r...
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Answered by Kai A. • Maths tutor
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