Alleles and inheritance
Alleles and inheritance
A gene is a section of DNA that influences a characteristic. Different forms of the same gene are called alleles, and an organism usually inherits two alleles for each gene, one from each parent.
Step-by-step lessons on AQA GCSE Biology 6.1.6 Genetic inheritance. Each one builds up to exam-style questions. Start with the foundational topics and build up to the higher-tier material.