Biology·Development & continuity of life · NSSCO 4.4.3
Variation & mutation
Narrated lesson · press play
Why no two individuals are the same — genetic and environmental variation, the continuous and discontinuous kinds, how mutation creates new alleles, and the remarkable link between sickle-cell and malaria.
What you'll learn in this lesson
By the end you should be able to (NSSCO Biology 4.4.3):
- Define variation; state that phenotypic variation has genetic and environmental causes
- Describe continuous and discontinuous variation with examples
- Define gene mutation and outline the effects of radiation and chemicals on mutation rate
- Describe sickle-cell anaemia and the link between its allele and malaria
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Miss Rachel and Mike talk through the whole topic — with the figure and working drawn live.