SSC MTS EXAM

Detailed explanation-1: -Explanation: TTA-CGC-AAG The mutated DNA segment is TTC-GCA-AG. This is an example of a deletion mutation.

Detailed explanation-2: -Deletion. Deletion mutations are actually the cause for a large number of genetic diseases, such as two-thirds of cystic fibrosis cases and the cat cry syndrome, which is so-called because children with this syndrome often have a cry that sounds similar to a cat meowing.

Detailed explanation-3: -Changes that take place in an organism over its lifetime (for example, darkening of human skin due to exposure to sunlight) normally have no effect on the organism’s genetic makeup and because of this will not be passed on to the organism’s offspring.

Detailed explanation-4: -Because an insertion or deletion results in a frame-shift that changes the reading of subsequent codons and, therefore, alters the entire amino acid sequence that follows the mutation, insertions and deletions are usually more harmful than a substitution in which only a single amino acid is altered.