- Use quick questions to check pupils' recall of cell structure and making new cells. Review fertilisation in terms of the fusion of nuclei and discuss how this results in characteristics being passed from parents to offspring.
- Ask the pupils to speculate on how identical and non-identical twins occur,
eg by providing them with statements containing correct and incorrect explanations
from which to select.
- Establish with pupils that, whether fertilisation is internal or external, it involves the fusing of male and female nuclei and involves the combination of characteristics of both parents.
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- explain that sperm and egg each contain half the inherited information needed and relate this to the concept of identical and non-identical twins
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