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Edexcel IGCSE Biology 2.86 Nervous and Hormonal Communication Questions

Practise comparing nervous and hormonal communication using body systems, response speed data, hormones and behaviour contexts.

Syllabus
First assessment 2019
Course
Biology 4BI1

Exam points

  • distinguish nervous and hormonal control by signal type, target cells and response duration
  • calculate speed ratios after converting units between centimetres, metres, seconds and minutes
  • link adrenal glands or neurotransmitters to behaviour through adrenaline or nerve signalling

Edexcel IGCSE Biology 2.86 Nervous and Hormonal Communication Questions question 1

[Maximum number: 3]

Fur colour in rats is controlled by a gene with two alleles.

One allele codes for black fur colour. The other allele codes for agouti fur colour.
Several female rats with agouti coloured fur are mated with several male rats with black coloured fur.

All of the offspring have agouti coloured fur.

Scientists observed that genes that control fur colour in rats can affect rat behaviour, such as how tame they are.

Other genes that control the size of the adrenal glands and the production of neurotransmitters also affect rat behaviour.

Scientists also noticed that coat colour is associated with differences in anatomy and physiology, such as the size of the adrenal glands and the production of neurotransmitters.

Explain why the size of the adrenal glands and the production of neurotransmitters would affect rat behaviour.

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