IB Biology D3.2: Inheritance (first exams in 2025)

This lesson can be purchased as part of the IB Complete course bundle (first exams 2025) at a heavily discounted price, formed of 40 fully resourced lessons, end of topic exams and student checklists. It can be found here

This PowerPoint contains everything you need to teach the Theme/Unit D3.2: Inheritance in the new IB Biology specification.

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This Powerpoint consists of over 100 slides and contains the followings:

All the information the IB have included in the new spec.

• Clear diagrams
• Student friendly content
• Summary videos
• Student research tasks
• Clearly identified HL and SL content
• Student checklist
• Summary

The following content is included:

D3.2.1: Outline that haploid cells (with a single copy of a gene) produced by each parent can fuse to form a diploid zygote with two copies of a gene.
D3.2.2: Explain methods for how flowering plants are genetically crossed.
D3.2.3: Distinguish between genotype (combination of inherited alleles) and phenotype (observable traits resulting from genotype plus environmental factors).
D3.2.4: Explain the ways that members of the same species can have variety in the gene pool.
D3.2.5: Describe the inheritance of different blood types.
D3.2.6: Compare and contrast the differences between incomplete dominance and codominance.
D3.2.7: Describe that the sperm determines sex in humans.
D3.2.8: Describe haemophilia as an example of a sex-linked genetic disorder.
D3.2.9: Illustrate how pedigree charts are used to determine inheritance in family members.
D3.2.10: Distinguish between continuous variation such as skin colour and discrete variation such as ABO blood group.
D3.2.11: Illustrate continuous variables using box-and-whisker plots.
D3.2.12: Explain how unlinked genes segregate and assort independently in meiosis.
D3.2.13: Predict the inheritance of pairs of unlinked genes in dihybrid crosses.
D3.2.14: Predict genotypic and phenotypic ratios in dihybrid crosses of unlinked autosomal genes using Punnett grids.
D3.2.15: Explain why linked genes fail to assort independently.
D3.2.16: Deduce genotypic and phenotypic possibilities of crosses of individuals heterozygous for two traits with those homozygous recessive for both traits in both linked and unlinked genes.
D3.2.17: Calculate statistical significance of observed vs calculated data using chi-squared tests.