The inheritance of earlobe type is controlled by a single gene with two alleles: E E\,E for free earlobes (dominant) and e e\,e for attached earlobes (recessive).
People with free earlobes have the genotype EE EE\,EE or EeEeEe, while people with attached earlobes have the genotype eeeeee.
A survey of a local town showed that 14% of the population has attached earlobes.
Using the Hardy-Weinberg principle, calculate the percentage of heterozygous individuals in this town.
Use the equations:
p+q=1andp2+2pq+q2=1 p + q = 1\quad \text{and} \quad p^2 + 2pq + q^2 = 1 p+q=1andp2+2pq+q2=124.1%
39.2%
46.8%
62.6%
32 exam-style questions on OCR A A Level Biology Patterns of inheritance. Each one has a worked solution and a mark scheme showing where the marks go.