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What is crossing over?

Crossing over is a process that happens during meiosis and results in genetic variation in gametes. It happens between prophase and metaphase. Pairs of homologous chromosomes lined up next to each other touc...
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Answered by Erin B. • Biology tutor
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What are the similarities and differences between photophosphorylation and oxidative phosphorylation?

Both processes operate on the same basic principle; passing electrons down a chain in order to create a proton (H + ) gradient , allowing the formation of ATP . The biggest difference is where they occur. Ph...
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Answered by Gloria M. • Biology tutor
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Explain the causes and consequences of sickle cell anaemia (5)

Sickle cell anaemia is caused by a point mutation, exchanging adenine for thymine in the DNA codon CTC. This causes a change in the mRNA to GUG, which results in a change in the polypeptide sequence during p...
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Answered by Anna S. • Biology tutor
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How do you factorise the following quadratic: x^2 - 5*x - 14?

An example of an application of factorising quadratics is to find the unknown in the equation, x. Factorising means writing the above equation in the form (x+a)(x+b)=0 Using FOIL (First, Outer, Inner, Last) ...
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Answered by Emma P. • Maths tutor
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Explain the effects of German hyperinflation? (6)

The German hyperinflation of 1923 had severe socio-economic and political consequences for the stability of the Weimar Republic. Economically, the value of the Papiermark rapidly plummeted over the course of...
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Answered by Benedict S. • History tutor
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