Mutations

Question 1

Answer 1

• It transports serotinin from the synaptic cleft to the presysnaptic neuron after an action potential has ocurred.
• This means the presynaptic neurson is able to reuse srotinin and it stops serotinin recpeots being activated in the post-synaptic neuron to allow the post-synaptic neuron to repolarise.

Question 2

Answer 2

The promoter region controls how likely RNA polymerase is to attach to and transcribe the DNA of the serotonin receptor gene.

A mutation might result in more or less transcirption of a gene resultiung in greater or lesser numbers of the serotonin recpetor in the presynaptic membrane iof the neuron.

Question 3

Answer 3

No effect because teh intron regions are noncoding and cut out of teh mrna after transcription so are not translated into polypeptides so dont affect the AA sequence

Question 4

Answer 4

There ius a correlation.

So it is possible trhat there is a relationship between teh short SERT allel and anxious poersonalityv traits

But the evidence shown doesnt suggest that the allele causes anxious perosnality traits