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.
Translocations can alter the phenotype is several ways: 1  the break may occur within a gene destroying its function. 2  translocated genes may come under the influence of different promoters and enhancers so that their expression is altered. 3  The t(8;14) translocation in Burkitt's lymphoma (figure) is an example.