A dysfunctional Eustachian tube that is always open is called a patulous Eustachian tube. Patients with this rare condition are plagued by chronic ear infections. A much more common problem is a failure of the Eustachian tube to effectively regulate air pressure.
A frameshift mutation (also called a framing error or a reading frame shift) is a genetic mutation caused by indels (insertions or deletions) of a number of nucleotides in a DNA sequence that is not divisible by three.he frameshift mutation will also alter the first stop codon (UAA, UGA or UAG) encountered in the sequence. The polypeptide being created could be abnormally short or abnormally long, and will most likely not be functional.
They are frameshift mutations. A frameshift mutation alters the âreading frameâ of the DNA sequence and changes all the amino acids in the protein product after the point of mutation. Substitution mutations merely replace one base with another.Because the genetic code is redundant some substitutions will have no effect at all. frameshift mutation alters the âreading frameâ of the DNA sequence and changes all the amino acids in the protein product after the point of mutation. Substitution mutations merely replace one base with another. Because the genetic code is redundant some substitutions will have no effect at all.