Yasser
My wife and I are both molecular biologists by training. I used to work in human gene therapy and my wife still runs a genetics lab at a local university. I listen to herpers (including myself at times) talk about genetics with a bit of tongue-in-cheek (I am not referring to your comments). Visible traits have two origins either genetic or environmental/developmental. Things like color generally have multiple genes associated. Some characteristics are determined by things like fetal development during incubation, mothers biochemistry, temps and health etc etc . Other visible characteristics arise because of events that occur as a snake lives. Sunlight, disease, diet etc etc all influence how an animals looks. Remember that a gene codes only for a single protein but many proteins can be affected by developmental factors. So, how does this fit into the idea of a "morph". Technically morphology refers to any visible trait while geneotype refers to genetic make-up. If color is due to a gene(s) either dominant, co-dominant, partial dominance or recessive etc then offspring can/will inherit those genes or gene (if eggs and sperm that fuse are carrying that allele). Thus they would be (under my proposal) het for a gene that codes for a color variation. If this snakes unusual dark color is caused by environmental factors then of course the offspring will not carry the gene (s) but may carry the same genetic make-up that allowed their mother to turn dark under givin conditions. Should any of the physical characteristics be called a morph? I dont know, do we call blonde haired people a morph? I dont, but I also dont refer to an albino ball python as a morph unless I am talking to other herpers.
One of the recurrent themes in public understanding of genes is the idea that genes go away or skip generaton etc etc. I think herpers are unconsciously guilty of this to some extent. In humans we always find it strange when an child is born with red hair but neither the parents or grandparents have red hair. The gene or genes did not just randomly appear. They have been hanging around for a few generatons recessively waiting for the right combination to occur. Then after 4 generations up pops a red haired child. I suspect this happens a bit in herps as well. Ask Bob Applegate about Thayeri Kingsnakes. Their color and pattern are always like a grab bag. Some, none or all of the babies can look like the parents. Two white milk phase thayeri might throw all leonis phase offspring. Some might even be all black. After three or four generation Thayeri begin to breed "true". This of course means that their color and pattern are genetic but quite complicated. If we only use the data from a single cross we might be tempted to say it is not genetic. Even two generations of inbreeding may still not reveal a single offspring that resembles a parent. I have Thayeris and I also have bloods, morelia etc. I hear people say "that striped blood isnt genetic". Bloods havent been around long enough to convince me of anything. Ball pythons seem to be quite predictable and probably represent years of captive breeding along with a fairly well defined gene pool in the wild. I really dont know much about morelia but I suspect their gene pool is very poorly defined with many intergrades and quite a lot of migration in relatively recent times. It sure is fun to look at though isnt it.
I am not sure why I wrote all of that I guess Im a little punchy from not getting enough sleep myself. I certainly appreciate your comments and input. I hope I get an opportunity to meet you and buy you a drink as payment for listening to my rant.
Take care
Steve