Biology for IGCSE & O level - Inheritance (Section 5 - No. 25)
Which of the following statements best describes the concept of alleles?
Alternative forms of a gene.
The physical characteristics of an organism.
The genetic makeup of an organism.
The observable traits of an organism.
Explicaţie
Alleles are different versions of the same gene, located at the same locus on homologous chromosomes.