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.
Best Answer: Missense mutations With a missense mutation, the new nucleotide alters the codon so as to produce an altered amino acid in the protein product.Nonsense mutations With a nonsense mutation, the new nucleotide changes a codon that specified an amino acid to one of the STOP codons (TAA, TAG, or TGA).Therefore, translation of the messenger RNA transcribed from this mutant gene will stop prematurely.uch mutations are said to be silent because they cause no change in their product and cannot be detected without sequencing the gene (or its mRNA). Insertions and Deletions (Indels) Extra base pairs may be added (insertions) or removed (deletions) from the DNA of a gene. The number can range from one to thousands.