Australian Year 10 Biology Practice Test 2026 – The Comprehensive Guide to Exam Success!

An allele is defined as a variant form of a gene. Genes exist in pairs and are located at specific positions (loci) on chromosomes. Each gene can have different versions that arise due to mutations or variations in the DNA sequence. These variations lead to different traits or characteristics, which is why alleles play a crucial role in the inheritance of traits.

For example, consider a gene that determines flower color in a plant species. This gene may have several alleles; one may code for red flowers, another for white flowers, and yet another for pink flowers. The combination of alleles an organism inherits from its parents will determine the flower color of the offspring.

Understanding this concept is essential in genetics as it lays the foundation for further topics like genetic variation, dominance, and inheritance patterns.