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What are dominant vs recessive alleles?

An allele is a version of a gene, for instance a gene that determines hair colour may have an allele for blonde hair and an allele for dark hair. We all have two copies of each gene because we inherit two ch...
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Answered by Sarah A. • Biology tutor
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What is meant by the term stroke volume?

Stroke volume is the amount of blood, in one contraction, that is pumped from the left ventricle of the heart. The normal range for this is 50-100ml.
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Answered by Livia K. • Biology tutor
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When a nerve impulse arrives at a synapse, it causes the release of neurotransmitter from vesicles in the presynaptic knob. Describe how.

Membrane depolarisation arrives at the pre-synpase and causes Ca2+ voltage-gated channels to open. This allows Ca2+ ions to diffuse in the presynapse via the activated Ca2+ channels. Ca2+ influx in the presy...
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Answered by Georgios M. • Biology tutor
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How to we acquire monoclonal antibodies

Firstly - What are antibodies? Antibodies are part of the immune system which are specific to the pathogen. They help destroy the pathogen.And what are monoclonal antibodies? They're just antibodies that are...
HG
Answered by Helen G. • Biology tutor
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How is DNA replicated?

DNA replication starts at an origin - eukaryotic chromosomes have multiple origins whereas prokaryotic chromosomes have only one. Here an enzyme called helicase separates the existing ("parental") ...
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Answered by Sarah A. • Biology tutor
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