Different versions of the same gene are called:

1. A pea's genetic makeup consists of two homologous copies of each chromosome, one from each parent. 2. The two copies can carry different versions of the same gene. 3. Gene variants that arise by mutation and exist at the same relative locations on homologous chromosomes are called alleles. 4. Green peas versus yellow peas is exactly such a pair. _Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 12 'Mendel's Experiments and Heredity', sections 12.1-12.3_