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GCSE Biology · key term
A comparison of quantities showing their relative amounts, such as 1 : 1.
Used by AQA and OCR
Specification 4.1.1.2, 4.6.1.8 · Paper 1, Paper 2
A comparison of two quantities, such as the estimated area of the cytoplasm compared with that of the nucleus.
Revise: Microscopy Practical and Size EstimationAreas can then be expressed as a ratio.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A comparison between quantities, written using a colon, such as .
Revise: Ratios and ProportionsA ratio compares quantities in a stated order. To simplify it, divide every part by the same common factor.
State what each part of a ratio represents, and keep the categories in the order named in the question.
Simplify ratios fully: for example, becomes .
Count genotypes and phenotypes separately. In a heterozygous cross, a genotype ratio can produce a phenotype ratio.
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