Variation can be under genetic control.
Which statement about the genetic control of variation cannot be true for continuous variation?
Variation is controlled by a single gene with two alleles.
Variation is controlled by many genes on different chromosomes.
Variation is controlled by multiple alleles at many different loci.
Variation is controlled by many genes that have small, cumulative effects.
32 exam-style questions on OCR A A Level Biology Patterns of inheritance. Each one has a worked solution and a mark scheme showing where the marks go.