IGCSE biology notes on inheritance need Punnett square practice, allele definitions, and a clear mitosis vs meiosis comparison table.

Hub: IGCSE biology notes · Inheritance exam tips · Variation guide.

Genetics note sections

Section	Key terms
DNA	Double helix, bases A-T C-G (pairing)
Genes & alleles	Dominant, recessive, homozygous, heterozygous
Meiosis	Genetic variation — crossing over (if required)
Selection	Natural vs artificial — one example each

Worked crosses

Keep three solved Punnett examples in notes (mono, dihybrid if Extended).

Frequently asked questions

Sex-linked inheritance?

Add if on Extended — check syllabus.

Genetic engineering notes?

See biotechnology guide — separate page.

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