A long-term health survey follows 1,250 adults at increased risk of an inherited disorder. At the end of the survey, 72% have not developed the disorder. DNA sequence comparisons show that 8% of these unaffected adults carry an allele associated with the disorder.
How many participants have neither the disorder nor the associated allele?
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900900900
100100100
727272
96 exam-style questions on Edexcel GCSE Biology 3.4 Variation and the Human Genome Project, covering 3.4.1 Causes of variation, 3.4.2 Outcomes of the Human Genome Project, 3.4.3 Genetic variation within a population, and 3.4.4 Effects of genetic mutations on phenotype. Each one has a worked solution and a mark scheme showing where the marks go.