IGCSE Biology / Chromosomes, genes and DNA
Allele, genotype, phenotype, dominant, recessive
Edexcel International GCSE Biology (4BI1), chapter 16: Chromosomes, genes and DNA, specification point 3.19, 3.20. Part of the full course.
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Genetic terms describe the versions of genes an organism has and the characteristics you can observe. Using the terms and genotype lettering correctly helps you explain how inherited characteristics appear.