Edexcel International GCSE (9–1) Biology (Modular) 4XBI1 · 4.33
Genetic and environmental variation
- Code
- 4.33
- In
- 4b Inheritance
- Topic
- 4 Reproduction and inheritance
- Course
- International GCSE (9–1) Biology (Modular) 4XBI1
- Board
- Edexcel
Grade boundaries·Edexcel command words
Codes and titles are read by a script from Edexcel's published specification and have not been checked by a person. What each point covers is in the specification itself: Edexcel’s specification.
Points in 4b Inheritance
- 4.14 Genomes and genes
- 4.15 Chromosomes and genes in the nucleus
- 4.16B Structure of DNA
- 4.17B Structure of RNA
- 4.18B Protein synthesis: transcription and translation
- 4.19 Alleles and inherited differences
- 4.20 Genetic terms: dominant, recessive, genotype, phenotype
- 4.21B Codominance
- 4.22 Polygenic inheritance
- 4.23 Monohybrid inheritance and genetic diagrams
- 4.24 Family pedigrees
- 4.25 Probabilities in monohybrid crosses
- 4.26 Sex chromosomes
- 4.27 Sex determination at fertilisation
- 4.28 Mitosis
- 4.29 Uses of mitosis
- 4.30 Meiosis and haploid gametes
- 4.31 Random fertilisation and variation
- 4.32 Diploid and haploid chromosome numbers in humans
- 4.33 Genetic and environmental variation
- 4.34 Mutation
- 4.35B Effect of DNA changes on phenotype
- 4.36B Effects of mutations on phenotype
- 4.37B Causes of increased mutation rates
- 4.38 Darwin’s theory of evolution by natural selection
- 4.39 Antibiotic resistance in bacteria