lioste1990 Posted January 6, 2014 Share Posted January 6, 2014 if anyone can surely answer this.... Link to comment Share on other sites More sharing options...
Endy0816 Posted January 6, 2014 Share Posted January 6, 2014 Scents are different chemical compounds, considerably more complex than photons. 1 Link to comment Share on other sites More sharing options...
lioste1990 Posted January 6, 2014 Author Share Posted January 6, 2014 thanks, but i expected a more specific answer if my teacher finally ask this in the final exam.. Link to comment Share on other sites More sharing options...
CharonY Posted January 6, 2014 Share Posted January 6, 2014 Except in the broadest sense (i.e. evolution and mechanistic reasons given by Endy) there is no simple true and detailed answer for this. To complicate matters, for many of the identified genes belonging to same family, many may not be functional. That is, they may not be expressed at all, carry inserts and so on. If someone asks a question like this, one does not expect a correct answer as in multiple choice questions,but it is rather used to gauge how much you understand basic topics (the answers could be different if asked from a evolutionary, developmental, physiological or e.g. genetic point of view). Instead, one would expect to give some kind of speculation that is well-founded in the material provided in class (bonus points if further sources are used). 3 Link to comment Share on other sites More sharing options...
Ringer Posted January 6, 2014 Share Posted January 6, 2014 To add to what was said above, one must also take into account what species is being talked about. If no species is mentioned you should probably think about the relative importance of visual systems vs. chemical receptor systems in early evolutionary development. Specifically even some of the most primitive organisms have chemoreceptors that can be used to accurately detect specific compounds, while vision is an 'overview' of what something contains without specificity. Also, chemical receptors are used both internally and externally (though very specialized in olfactory systems) it was probably a very early and relatively easy adaptation to go from internal chemical receptors to external chemical receptors. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now