Medical Genetics A heterchromatin and euchromatin The degree of condensation of the nuclear dna is variable Strongly condensed DNA is called heterochromatin, ess condensed one euchromatin Heterochromatin is stained more intense than euchromatin by certain nuclear dyesMedical Genetics A. heterchromatin and euchromatin The degree of condensation of the nuclear DNA is variable. Strongly condensed DNA is called heterochromatin, Less condensed one euchromatin. Heterochromatin is stained more intense than euchromatin by certain nuclear dyes