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.
There is plenty of evidence that demonstrates how epigenetic changes (and not changes in the DNA of a gene) have been passed on to the next generation. For example: 1  Drosophila melanogaster-the fruit fly has white eyes.2  Embryos develop in temperatures of 25 degrees Celsius.here are several epigenetic ways that a gene can be modified, that is having its expression altered without changes to its DNA. Two of the most widely studied are DNA methylation and histone modification. 1) DNA methylation-where methyl groups latch onto parts of a DNA sequence and can switch a gene on or off.