Question 36
FScientists studied 500 mutations in the DNA of fruit flies.
The Figure shows the effect of these mutations on the phenotype of the fruit flies.
Figure
a.[1]
Use the Figure to give the percentage of mutations that had a small effect on the phenotype.
b.[2]
Calculate the number of mutations that had a significant effect on the phenotype.
c.[1]
Describe what the Figure shows about the effect of most mutations on the phenotype.
d.[1]
State how new alleles arise in a population.
3.4 Variation and the Human Genome Project Questions
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.