Heartworms are spread to dogs through mosquito bites. Up to 14 inches long, a heartworm lives in the heart and the arteries that carry blood from the heart to the lungs. Heartworms affect how the heart functions and how blood clots and is likely to cause death if untreated. Monthly heartworm preventives are effective.
missense mutation. A substitution of a single DNA nucleotide for another. This results in the transcription of a different amino acid than is normally found in the protein coded by the gene. Missense mutations are found in diseases such as sickle cell anemia.
Answers. Best Answer: These mutations refer to protein coding regions of the genes. A silent mutation is one that changes a DNA nucleotide, but the DNA still codes for the same amino acid in the resulting protein (some amino acids have multiple DNA triplets that code for them).A missense mutation changes the coding for an amino acid such that a different amino acid is put into the resulting protein.A nonsense mutation changes the DNA triplet so that no amino acid has that coding (such as a stop sequence). missense mutation changes the coding for an amino acid such that a different amino acid is put into the resulting protein. A nonsense mutation changes the DNA triplet so that no amino acid has that coding (such as a stop sequence).