The biologist is using a type of standard English known as jargon (answer C). Jargon refers to specialized vocabulary or technical terminology used by people within a particular profession or field of study. In this case, discussing genomes and karyotypes is specific to the field of biology, and biologists have developed a set of terms and concepts that are unique to their field. By using this specialized terminology, biologists can communicate more efficiently and precisely with others who are knowledgeable in the same area of study.
