Answer: one of the main characteristics of the two homologous chromosomes is the same gene loci.
Explanation: Homologous chromosomes have the same genes located at the corresponding positions known as gene loci.
They have a smaller size, length and banding pattern under the observation of a microscope. During meiosis, homologous chromosomes pair up and undergo genetic recombination, facilitating genetic variation. These are some of the main characteristics of homologous chromosomes.