Genetics explains why children resemble their parents. Mendel's experiments laid the foundation.
Key points
- Dominant allele masks recessive
- Punnett square predicts offspring ratios
- Genotype vs phenotype
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WAEC tip
Always draw the Punnett square: working shown = marks earned even if you get the ratio wrong.
Practise this
Two heterozygous tall plants (Tt) are crossed. Show the Punnett square and give the phenotype ratio.
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