Final answer:
The question involves determining which two genes are closest on a genetic map of Drosophila, indicating their likelihood of being inherited together due to fewer recombination events between closely linked genes.
Step-by-step explanation:
The question asked is focused on genetic mapping in Drosophila (fruit flies), which is a part of genetics in biology. Genetic maps provide the relative locations of genes on a chromosome. The closer two genes are on a genetic map, the greater probability they will be inherited together because fewer recombination events will occur between them. Thus, the two genes that are closest on the map will have the smallest number of map units or centimorgans (cM) between them.
To determine which genes are most likely to segregate together, one would look for the pair with the shortest distance in centimorgans between them on the genetic map. If two genes are said to be linked, it means they are located close together on the same chromosome and tend to be inherited together more often than not due to the proximity that reduces the likelihood of recombination separating them.