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.
5. What is the difference between a missense mutation and a nonsense mutation? Point mutations can be classified as a base substitution or an insertion/deletion but they are also classified on whether the change produces a premature stop in the gene.Nonsense mutations are mutations that result in a premature stop.. What is the difference between a missense mutation and a nonsense mutation? Point mutations can be classified as a base substitution or an insertion/deletion but they are also classified on whether the change produces a premature stop in the gene.