The decrease in the number of opsin genes and the deficiency of full color vision that appeared in the ancestors of mammals is that primitive mammals are nocturnal. The owl monkey is the only nocturnal species among higher primates. And naturally, examination of its SWS opsin gene shows that it also has collected mutations that render it nonfunctional. Only 60 bases code for the opsin protein, the owl monkey contain a mutation that alters a TGG into TGA, one more situation of a stop triplet that terminates the translation of the leftovers of the genes.
Bush baby is strictly nocturnal, examining its SWS opsin gene shows that the gene has turn out to be a fossil in the species. The gene of the bush baby has a huge portion of code missing close to the start of the gene that destroys the capacity to create opsin.
The blind mole rat is a rodent that contains the most weakened eyes of any mammal that cannot detect images. And even though the eyes themselves worked, seeing would yet be hard as they are situated entirely beneath the skin and enclosed by a layer of fur. Examining of the blind mole rat shows two integral opsin genes, a red-shifted MWS/LWS pigment that is adjusted to detect the light received by the subcutaneous eye and a dim-light rhodopsin. Although it’s a too thin vision, selection remains on these genes, actually in turn to manage the animal’s biological clock. Though its SWS opsin gene is a fossil and has several mutations that disturb the content of the code for creating the SWS opsin protein.
In the owl monkeys, bush baby and blind mole rat, the fossilization of the gene is associated with the habitat in which the species live. In every situation the accurate incision in the SWS opsin gene is dissimilar.