STEM
Biology, step by step
Biology explanations connect concepts to processes, from Punnett squares and genetic probabilities to cellular respiration and ecosystems.
Coverage
Topics we cover
- Cell biology
- Genetics and inheritance
- Evolution
- Human physiology
- Ecology
- Molecular biology
Worked example
BiologySolved
Question
Two Aa parents: what is the probability of an aa offspring?
- Step 1: Each parent passes on A or a with a probability of ½
- Step 2: The offspring is aa only if both parents pass on a
- Step 3: Multiply the probabilities: ½ × ½
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