Final answer:
The 'total ridge count' appears to be a misplaced term in the context of X-linked genetic traits, where the son of a carrier mother and a normal father has a 50% chance of inheriting the recessive trait. An accurate minimum total ridge count cannot be determined without further context.
Step-by-step explanation:
The minimum total ridge count in a son with the same genotype, where the genotype in question refers to a recessive X-linked trait, is related to genetics. If the mother is a carrier for this trait and the father has normal vision, the son has a 50% chance of being affected by the trait, assuming it is a trait like color blindness. However, the original question about 'total ridge count' appears to be a typo or an error since ridge count typically relates to fingerprints and not directly to X-linked genetic conditions as described here. Therefore, without additional context regarding 'ridge count' in the genetic scenario, providing an accurate minimum total ridge count is not possible.