I typed "c dna mutation" in Google and this article was the first hit:
The "c" denotes coding DNA, which given the context of the amino acid mutation having the letter "p", this makes sense.
This question does not make much sense in biology.
The problem is the definition of qualitative and quantitative in biology. Quantitative just means can be represented by a mathematically sound numeric measurement. You can measure things like chemical levels or dimensions, and they make mathematical sense, 2Um is twice 1Um.
There are binary states in ...
The polymorphism in the gene product of the human ABO locus seems
to provide an example of what the question demands. It does not
involve a gene duplication or recovery from loss of function; rather it involves changes that cause
interactions with a different ligand, and the mutations that produce
these changes have been identified and examined at a ...