Combined Science GCSE
Probability
What Probability means in Combined Science GCSE, as defined for AQA.
Definitions of Probability
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Reference: AQA
The chance that a particular genotype or phenotype appears in one offspring, calculated from the equally likely gamete combinations.
Found by dividing the number of favourable outcomes by the total number of outcomes, so a 3:1 ratio gives 3 ÷ 4 = 0.75 or 75%.
The chance for each offspring, expressed as a fraction, decimal or percentage, and not a guarantee about a particular family.
Topics that use Probability
- Genetic inheritance (AQA GCSE)
- Sex determination (AQA GCSE)
Related terms
Using Probability in the exam
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