Some human traits, such as the ability to roll the tongue, are discrete (individuals can either roll their tongue or they cannot). In contrast, traits like body mass or adult height show a continuous range of phenotypes.
Which of the following statements about the genetics of these traits is correct?
Tongue-rolling ability is controlled by a single allele.
Continuous variation in traits like height is typically caused by multiple genes working together.
Traits that show a continuous range of phenotypes are determined solely by environmental factors.
Discrete traits are controlled by multiple genes on different chromosomes.
97 exam-style questions on OCR GCSE Biology 5.1 Inheritance, covering 5.1.1 The genome, 5.1.2 Environment and phenotype, 5.1.3 Variants and mutations, 5.1.4 How genetic variants influence phenotype, 5.1.5 Asexual and sexual reproduction, 5.1.6 Haploid and diploid, 5.1.7 Meiotic cell division, 5.1.8 Single gene inheritance, 5.1.9 Predicting single gene crosses, 5.1.10 Sex determination, 5.1.11 Multiple gene inheritance, and 5.1.12 Development of our understanding of genetics. Each one has a worked solution and a mark scheme showing where the marks go.