Final answer:
The concept described in the question is a chromosomal deletion, which involves the removal of a segment of DNA, resulting in a chromosome with missing genes.
Step-by-step explanation:
The question pertains to the concept of a chromosomal deletion, a type of mutation where a segment of DNA is lost, leading to a chromosome that is missing some genes. Deletions can have a range of effects on an organism's phenotype, depending on the functions of the genes that are lost. The 'deletion' of segment 'B' from a chromosome and the combination of segments 'A' and 'C' would result in a chromosome that no longer contains the genes located in segment 'B'. This can be an important factor in genetic experiments and breeding, such as those conducted by Barbara McClintock in maize or in the study of Drosophila linkage maps.