Two fish of the same species have different body masses. During their lives, one fish had a limited food supply and the other had an abundant food supply. A researcher concludes that the fish must have inherited different alleles.
Which statement best assesses this conclusion?
The conclusion is not supported because different food supplies could affect body mass without the fish having different inherited alleles.
The conclusion is supported because abundant food could lead to alleles for greater body mass being inherited.
The conclusion is not supported because fish of the same species are likely to inherit the same alleles for body mass.
The conclusion is supported because inherited alleles can affect body mass even if food supply can also affect it.
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.