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Describe how selective breeding could be used to improve the volume of milk produced by cows.

Calculating the milk yield of mother cows and their offspring can indicate which animals have good breeding genetics. Bulls also play an important role in generating a good milk yield, and their offsprings m...
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Answered by Saffron M. • Biology tutor
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Describe, with the use of an example, the process of natural selection in evolution.

An example could be the peppered moth which changed its colour in order to blend into the environment as it changed with the industrial revolution.Should explain that natural selection is where advantageous ...
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Answered by Rose B. • Biology tutor
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Give 2 differences between an animal and a plant cell.

Any 2 from: Plant cells have; cell wall (1), large vacuole (1), chloroplast (1) Animals cells are more irregular in shape, plant cells are more rigid and rectangular (1)
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Answered by Sarina G. • Biology tutor
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Can you explain the oxygen dissociation curve.

What is the graph telling us?On the graph, we can see two axes. We have partial pressure of oxygen on the X axis and Hb saturation on the Y axis. Partial pressure is another way of saying how much oxygen the...
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Answered by Thomas K. • Biology tutor
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What is the link between electrical activity of the heart and its contraction?

The electrical current is produced in the SA node (the primary pacemaker of the heart) and travels to the AV node via fibres in the walls of the atria. These impulses cause the muscular walls of the atria to...
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Answered by Stephen M. • Biology tutor
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