This document summarizes key concepts from Chapter 15 of Campbell Biology regarding the chromosomal basis of inheritance. It discusses how Mendel's theories were later linked to chromosomes through the work of scientists like Morgan. Morgan showed that genes are located on chromosomes through experiments with fruit flies. His discovery of sex-linked inheritance provided evidence that chromosomes are the physical location of genes. The document also discusses linked and unlinked genes, and how their positioning on chromosomes influences inheritance patterns and genetic recombination.