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3.3 Inheritance
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Genes, chromosomes and inherited information

Genes, chromosomes and inherited information

Labelled diagram showing DNA wound into chromosomes, a gene on homologous chromosomes with alleles B and b, and gametes passing one allele from each parent to offspring

Inheritance is the passing of genetic information from parents to offspring. Mendel showed that characteristics are controlled by inherited factors, now called genes.

3.3 Inheritance Lesson

  1. GCSE
  2. /Biology
  3. /3.3 Inheritance

Step-by-step lessons covering Edexcel GCSE Biology 3.3 Inheritance for Foundation and Higher tier. Each lesson breaks down 3.3.1 Gregor Mendel and the basis of genetics, 3.3.2 Alleles and inherited characteristics, 3.3.3 Monohybrid inheritance, 3.3.4 Determination of sex at fertilisation, 3.3.5 Outcomes from monohybrid crosses, 3.3.6 Inheritance of ABO blood groups, 3.3.7 Inheritance of sex-linked disorders, and 3.3.8 Multiple genes and phenotypic features, then works through exam-style questions in Paper 1 and Paper 2 format. Start with the foundational topics and build up to the higher-tier material.