Final Answer:
The sizes of the bands in which dideoxycytidine (ddC) had been added to the growing DNA strand would correspond to the positions where ddC terminated the synthesis, resulting in DNA fragments of different lengths.
Step-by-step explanation:
The question is likely referring to DNA sequencing using the Sanger method, where dideoxynucleotides (ddNTPs) are incorporated during DNA synthesis, causing chain termination at specific points. Each ddNTP is labeled with a different fluorescent dye, and the terminated fragments are separated by size in a gel.
The sizes of the bands, therefore, represent the lengths of the terminated DNA fragments. The band sizes would correspond to the positions where dideoxycytidine (ddC) was incorporated, resulting in fragments terminating at each ddC. The gel electrophoresis pattern generated would reveal the sequence of the template DNA. The specific sizes of the bands would depend on the sequence and the position of ddC incorporation.