Dolphins produce a variety of vocalizations, usually in the form of clicks and whistles. Dolphins are sometimes hunted in places like Japan, in an activity known as dolphin drive hunting. Besides drive hunting, they also face threats from bycatch, habitat loss, and marine pollution.
The DNA sequence of a gene can be altered in a number of ways. Gene mutations have varying effects on health, depending on where they occur and whether they alter the function of essential proteins. The types of mutations include:his type of mutation is a change in one DNA base pair that results in the substitution of one amino acid for another in the protein made by a gene.
Random changes to the genetic code. Copying errors when DNA replicates or is transcribed into RNA can cause changes in the sequence of bases which makes up the genetic code. Radiation and some chemicals can also cause changes. The examples which follow show some of the easier-to-understand effects of this.