Chromosomes show evidence of physical exchange. Genetic Maps 1. Crossing over occurs more frequently as the distance between two genes increases. Genetic map shows relative position of genes. Recombination map uses frequency of crossing over 3.
Linked genes are too close to assort independently.
Recombination at the gene level. The gene sequence in chromosome 1 changes from ABC to Abc. Blending heredity . The genes are passed on unaltered in the offspring. Importance of geographic isolation in speciation process Darwin did not consider isolation top play a major creative role in evolution.