Reassociation and hybridization properties of DNAs from several species of fish

Reassociation and hybridization properties from spectrophotometric studies of DNAs from 10 species of fish indicate:

1. Great diversity in the amounts of repeated sequences in the genomes of different species - more specialized fish had less redundancy.

2. Large differences in the complexities of the DNAs - more specialized fish had less information.

3. Little homology between sequences of remotely related species but substantial homology between sequences of closely related species.