You discover that the underlying cause of a disease is a protein that is now less stable than the non-disease-causing version of the protein. this change is most likely to be due to
a. a mutation within a gene.
b. a mutation within the regulatory dna of a gene.
c. gene duplication.
d. horizontal gene transfer.

A. a mutation within a gene.

Explanation:

According to my research on studies conducted by geneticists, I can say that based on the information provided within the question that this change is most likely due to a mutation within a gene. Which is a permanent change in the DNA sequence that makes up a gene, causing it to be very different than the normal gene.

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this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.

ya the other dude is right