CCEA GCE Biology · AS & A2

CCEA Biology practice questions, marked as you write them

65 exam questions built from our worked CCEA past paper answers, worth 333 marks in total. Write your answer, and every mark scheme point is checked against what you wrote — instantly, in your browser, with no account.

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A2 2 / A2 3 statistics question — recurring in every A2 2 series · 5 marks

A dihybrid cross gave 152 tall red, 39 tall white, 53 dwarf red and 16 dwarf white offspring (n = 260). Use a chi-squared test to determine whether these results differ significantly from a 9 : 3 : 3 : 1 ratio. The critical value at p = 0.05 with 3 degrees of freedom is 7.82.

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These questions are written in the style of the CCEA GCE Biology (2016) papers and are not reproduced from any live paper. CCEA owns the copyright in its question papers and mark schemes — always download the official paper and mark scheme from CCEA and use these worked answers alongside them. BioCCEA is an independent study tool and is not endorsed by CCEA.

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