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EnglandBiologyQuick questions
Module 6: Genetics, evolution and ecosystems
Quick questions on Patterns of inheritance: monohybrid, dihybrid, codominance, sex linkage and the chi-squared test - OCR A-Level Biology A
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the chi-squared test?Show answer
The chi-squared test () tests whether observed results differ significantly from those expected by a genetic ratio, or whether any difference is due to chance:
What is q1?Show answer
State the expected phenotypic ratio from crossing two organisms heterozygous for two independently assorting genes. [1 mark]
What is q2?Show answer
Explain why X-linked recessive conditions are more common in males than females. [2 marks]
What is q3?Show answer
Write the formula for the chi-squared statistic. [1 mark]
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