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.
Mutations. Changes to genes are called mutations mutation: An error in DNA replication which results in a change in an organism's genetic blueprint. Some mutations are random, others are caused by environmental factors.Mutations can be spontaneous (they just happen).They can also happen because of: 1  Radiation.ifferent types of cells produce different ranges of proteins. This affects the functions they can carry out. For example, only pancreas cells switch on the gene for making the hormone insulin. Mutations to genes can alter the production of certain proteins, or even prevent them being made by a cell.