Final answer:
True, linkage occurs when two loci are on the same chromosome, causing alleles to be inherited together during meiosis. This is crucial for the construction of linkage maps based on the frequency of recombination between genes.
Step-by-step explanation:
Linkage occurs when two loci are on the same chromosome, and this statement is true. When genes are located in close proximity on the same chromosome, their alleles tend to be transmitted together through meiosis. This is exemplified in a dihybrid cross where two genes, such as those for flower color and plant height, are located next to each other on a chromosome. As the distance between two genes increases, the likelihood of crossing-over during meiosis also increases, making the genes behave more like they are on separate chromosomes, which can lead to independent assortment. Through the study of recombination frequencies, geneticists have created linkage maps that show the gene locations on chromosomes.