Genotype
Exam-ready definition
The genetic make-up of an organism. The combination of alleles it carries for a characteristic, written as letters (e.g. RR, Rr or rr).
How this is marked
Always paired with phenotype in exam questions. State genotypes with defined letters and write the phenotype in words. Losing the definition marks here is pure carelessness. These are free marks if learned.
In an exam answer
Stating a cross result: 'The genotype of the heterozygous tall plant is Tt, carrying one dominant and one recessive allele.'
Full topic guide: Inheritance