A Mutations have a negative connotation Can an organism rece

Solution

A. Mutations are always not detrimental, It can be beneficial also. for example in few reported cases a mutation occured in a receptor protein which makes some peoples resistant to HIV as the virus unable to bind to its receptor. Another classic example being the humans possessing trichromatic vision (Red, green and blue) which differentiate from the other animals being mono or dichromatic vision is actually a beneficial mutation occured million years ago during evolutionary processes. Hence a beneficial mutation can be related with disease resistance or allows an organism to survive in an extreme environment due to the changes in the genetic material.

B. Not all the insects are radiation resistance but few insects like cockroaches are believed that they can sustain certain dosage of radioactivity, There are various mechanisms are believed to the basis for this resistance but they are not proved yet, One hypothesis is they do posssess special DNA repair mechanims by having more copy of genes involved in DNA repair in their genome similar like the proven Radioactive resistant bacterium Deinococcus radiodurans, Other mechanisms can be of Lack of penetration and enhanced capacity to repair without danaging the chromosomes. And one major commonly believed reason for the resistance in insects is the smaller chromosome or lesser genetic material than humans despite its size. Hence having less DNA makes easier to survive radiation exposure.