A school survey compares two students who follow different diets. The students have different body masses, and only one of them can roll their tongue.
A student claims that the difference in diet caused both differences between the students.
Which statement best assesses this claim?
The claim is supported because diet is likely to influence both body mass and tongue rolling.
The claim is not supported because body mass and tongue rolling are mainly controlled by one gene.
The claim is not supported because diet may affect body mass, whereas tongue rolling usually has little environmental influence.
The claim is not supported because diet can influence tongue rolling, whereas body mass has little environmental influence.
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.