The vertebrate pax-6 gene product (the pax-6 protein) triggers a complex program of gene expression resulting in formation of th
e vertebrate eye, which has a single lens. the fly pax-6 gene leads to formation of the compound fly eye. when scientists cloned a mouse pax-6 gene and introduced it into a fly embryo, it led to formation of the compound eye of a fly. what did scientists induce from this? the vertebrate pax-6 gene product (the pax-6 protein) triggers a complex program of gene expression resulting in formation of the vertebrate eye, which has a single lens. the fly pax-6 gene leads to formation of the compound fly eye. when scientists cloned a mouse pax-6 gene and introduced it into a fly embryo, it led to formation of the compound eye of a fly. what did scientists induce from this?
The PAX-6 gene is a gene that translates to the PAX-6 protein that serves as a transcription factor needed to activate certain genes that functions in the development of the eyes. While PAX-6 gene may look like it produces different functions for different species (such as formation of the compound eye in insects vs. formation of a single lens eye in vertebrates), it does not. It does in fact only regulate the genes required for the formation of the eyes. Absence or mutation of the PAX-6 gene will cause aniridia or absence of the iris, opaque lens and cornea, and a dysfunctional retina. Also, the function of the PAX-6 protein is conserved throughout evolution of species.
Nucleoside analogs are the mutagenic chemicals that have a structure that is similar to the normal bases of the nucleotide and thus can be incorporated in the DNA during the process of replication, however as it has different base-pairing rules than the normal nucleotide base it can lead to mutations.
An example of a nucleoside analog is acyclovir which an analog of guanosine.
Natural selection is the mechanism that these air-breathing fishes have gone through to survive. This mechanism allows species to survive and reproduce due to differences in the phenotypes of every individual in the specie, throughout the time the heritable traits that every individual inherits changes according to the environment and the characteristics of its ancestors.
