Genetics....

[Dcloud]

Hi bros,

I must first apologise as this thread could have been avoided if i diligently went to do my searches on Google... =(..

What i am trying to find out, learn, read is about Shrimp Genetics, probably in more favour of the Neocardina species.

So far my little search in forum led me to realise that Yellow is a recessive gene, but i would also like to find out further regarding this and the other colours available to Shrimps. Eg red, white, orange, blue, black etc

In the past i have done similar readings for Bettas, but i highly doubt that the information would be interlinked between the 2 entirely separate species ..

If you have any great links for me to refer to, that would be fantastic, however if you dont, lets wait together to see if anyone can share it with us =D (that is if you are as interested as i am )

Thanks all
(hopefully i dont get flamed for laziness... )

[14litre]

Try this site, bro:
http://www.planetinverts.com/

Not sure if it is what you are looking for.
You will see all the species on the Left Menu bar in that site. Lots of information in there. Have fun browsing.

[Navanod]

It's not always a straight forward recessive/dominant color genes relationship for shrimps.
The only confirmed recessive/dominant alleles would be the ones for black and red in the caridina sp. eg. crystal reds and black diamonds, wine reds and black king kongs.
For the neo-caridina sp. trying to cross them would actually result in wild colors, which may indicate that the yellow, red or blue colors could be recessive, but these may occupy different positions on the genes (and code for the colors independently) and so does not dominant each other.

[Dcloud]

Thanks bro 14litre =)

Mod Navanod, sorry but i remember somewhere saying that you had a biological background.. is that right?
Regarding the positions of the genes and codes.. I have no prior studies in biology even during secondary school etc.. so i cant relate to that..
But if processed in my head correctly, wild has colour ABC which gives its natural colour, but bred specifically to reduce AB to get "only" C.
And if i breed pure A + pure C i would not necessarily get B(or a colour between the 2) but something closer to wild consisting mainly of AC..?

Hopefully i am right ==" hahaha...

[Navanod]

Just call me Navanod please.

You're 1/2 correct, literally. Each genes comes as a pair, called alleles, one from the mother and the other from the father (exceptions to this rule applies for some strange creature, like snails, but for shrimps it applies).
Your example should be more like
Abc + abC = AabbCc
Capital letters are the active alleles while small letters are the recessive or inactive alleles.

In the case of CRS/BDS, the red/black is determined by this single pair of alleles, with the black dominant over the red. In another words, both alleles would need to be red in order for the shrimp to turn out red, but only 1 has to be black for it to turn out black. This is why CRS should never produce BDS, but BDS can produce CRS. This is also why, when you mix a (pure double black alleles) BDS with a CRS, all the offsprings will be BDS (but with a hidden red allele). Read up on Mendelian genetics if you're interested, its quite straight forward since it's still quite basic.
Note that again, exceptions to such a simply system exists and that many traits such as colors actually depends on many genes working together to produce so its not always so straightforward.

For neo-caridina, it is quite complicated and there are many possibilities as to why cherry shrimps are red but produces wild colored shrimps when mixed with yellow or blue pearl or even snowball shrimp.
Personally, one of my theories is that in red cherry shrimps, only the genes for red is functional. All the genes for other colors are somehow deactivated or both the alleles are damaged/mutated.
The same goes for yellow shrimps. So when they are crossed with each other, each parent contributes a working allele that compensates for the faulty one and so all the colors return.
It's also possible that there's some kind of incomplete or co-dominance system (means if the 2 alleles in a pair do not have a recessive/dominant relationship, both will contribute to the offspring's color).

Eg. If the CRS/BDS color is a co-dominance system, an offspring with 1 red and 1 black allele would turn out either in patches of red and black, or more likely, an overlapping color that can range from brown to purple. There are examples of brownish looking CRS/BDS and it would not be surprising since there are many sets of genes/pairs of alleles that affect colors all working in tandem.

Hmmm...quite confusing to me too and frankly, its difficult to know unless we do actual lab research and run the DNA sequencing.

[Dcloud]

Wow Navanod, thats really something huge to digest suddenly..

So with this, unfortunately our current information regarding the genes of shrimps are not detailed out yet.. guess this will take many trials and errors or literally a laboratory to figure things out.. not within my scope thats for sure

Thank you very much for this information Navanod, luckily i was able to relate to it because reading the betta ones before
And with that i might keep a journal with whatever i breed and see what comes about =)

[huizhong]

what about can BDSxBDS produce 3 different types of offsprings in a single batch which is bds/crs/sw ?
or only 2 different types in a single batch?