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What happens during prophase?

The chromosomes condense and become visible
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Answered by Adam S. • Biology tutor
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What is meant by the term polygenic inheritance? [2 marks]

This term refers to the idea that a single characteristic is encoded for my multiple genes at different loci . This gives rise to continuous variation.
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Answered by Odette F. • Biology tutor
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What is a reflex arc and how does it work?

A reflex is an unconcious response to a potentially harmful stimulus, such as pulling a tray out of the oven without oven gloves on! Reflexes bypass the brain and instead have a circuit that only passes thro...
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Answered by Polly C. • Biology tutor
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How does the citric acid cycle work, and what is oxidative phosphorylation?

The citric acid cycle (AKA the TCA cycle, AKA the Krebs cycle) is an incredibly important set of chemical reactions which is at the centre of how all aerobic organisms function. It is also really complicated...
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Answered by Frederick H. • Biology tutor
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What is a randomised controlled trial?

Randomised controlled trials are the most important way that new medical therapies (drugs, devices, procedures and so on) are tested. ‘Controlled’ means that volunteers in the trial are split into groups. On...
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Answered by Frederick H. • Biology tutor
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