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EnglandBiologyQuick questions
3.7 Genetics, populations, evolution and ecosystems
Quick questions on Inheritance: monohybrid and dihybrid crosses, codominance, sex-linkage, epistasis and the chi-squared test - AQA A-Level Biology
3short 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 q1?Show answer
Distinguish between genotype and phenotype, and explain why most human phenotypes cannot be predicted from a single gene. [3 marks]
What is q2?Show answer
A plant heterozygous for two unlinked genes () is self-pollinated. State the expected phenotypic ratio and explain what a deviation to a 9:3:4 ratio would indicate. [3 marks]
What is q3?Show answer
In a cross, the expected ratio was 1:1 but the observed counts were 58 and 42 (total 100). Carry out a chi-squared test and state your conclusion. Critical value at p = 0.05, 1 degree of freedom = 3.841.
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