Question 2
FA student measured the shell length of 200 snails from one population. All the snails lived in the same garden.
The Figure shows the results.
Figure
a.[1]
Give the most common range of shell lengths.
b.[2]
Calculate the percentage of snails with a shell length of 30 mm or more.
c.[2]
The snails all live in the same garden.
Suggest why the snails show variation in shell length.
d.[3]
A student said:
"All of the variation in shell length is caused by genes."
Evaluate this statement.
3.4 Variation and the Human Genome Project Questions
40 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.