In a study of leaf width, pure-breeding plants with broad leaves were crossed with pure-breeding plants with narrow leaves. Leaf width is controlled by one gene. All first-generation offspring had broad leaves. When these offspring were crossed with one another, both broad-leaved and narrow-leaved plants were produced.
Explain how these results challenge the idea that inherited characteristics always blend.
71 exam-style questions on Edexcel GCSE Biology 3.3 Inheritance, covering 3.3.1 Gregor Mendel and the basis of genetics, 3.3.2 Alleles and inherited characteristics, 3.3.3 Monohybrid inheritance, 3.3.4 Determination of sex at fertilisation, 3.3.5 Outcomes from monohybrid crosses, 3.3.6 Inheritance of ABO blood groups, 3.3.7 Inheritance of sex-linked disorders, and 3.3.8 Multiple genes and phenotypic features. Each one has a worked solution and a mark scheme showing where the marks go.