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GCSE Biology · key term
A grid showing the possible combinations of alleles an offspring could inherit from two parents.
Used by AQA, Edexcel and OCR
Specification 4.6.1.6, 4.6.1.8 · Paper 2
Revise: Predicting Inheritance: Punnett Squares and ProbabilityA Punnett square lays out the possible ways those alleles can meet. It predicts possible offspring genotypes (allele combinations), from which you can work out phenotypes (expressed characteristics).
A grid used to display all possible combinations of genetic information from two parents’ gametes.
Specification 3.14, 3.15, 3.16 · Paper 1
A grid that combines the possible gametes from two parents to predict offspring genotypes.
Revise: Monohybrid InheritanceA Punnett square organises the gamete combinations in a grid. Put one parent's possible gametes across the top and the other parent's down the side. In each box, combine the allele at the top of its column with the allele at the start of its row.
A genetic diagram showing the possible combinations of chromosomes or alleles inherited from two parents.
A grid used to show the possible allele combinations in offspring from a genetic cross.
Specification B5.1j, B5.1k · Paper 2 (Foundation), Paper 4 (Higher)
A grid showing the possible combinations of alleles that offspring can inherit from two parents.
Revise: Predicting resultsA Punnett square organises all the possible combinations so that we can predict genotypes and, where the relationship between the alleles is known, phenotypes.
A grid showing the possible combinations of genetic material contributed by two parents' gametes.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A genetic diagram that displays the possible combinations of parental alleles in offspring.
A grid that combines the possible alleles in two parents’ gametes to predict offspring genotypes.
A grid that combines the alleles in parental gametes to show the possible offspring genotypes.
A grid showing all possible combinations of alleles from the gametes of two parents.
A genetic diagram used to show the possible chromosome or allele combinations in offspring and their probabilities.
State what each letter represents before completing a Punnett square. Use the same letter in upper and lower case for the dominant and recessive alleles.
Write one allele, not the parent's whole genotype, beside each row or column of a Punnett square.
Treat the outcomes in a Punnett square as probabilities for each fertilisation, not as a guarantee that every small family will contain offspring in exactly those proportions.
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