The correct answer is: (D) Strutvent.
Gene-mapping is a technology used to determine the location and sequence of genes on chromosomes. This technology has been crucial in the study of genetics and is used to understand genetic diseases, traits, and inheritance patterns.
The technology for gene mapping was first developed by Strutvent, who made significant contributions to the understanding of the genetic code and gene organization. This development has enabled the identification of specific genes associated with various traits and diseases in humans and other organisms.
Thus, the correct answer is (D) Strutvent, who developed the technology behind gene mapping.