Singapore Long Kang Fish, Wild Guppies/Endlers.

**vannel** · 26th Jan 2016, 00:19

I'm of the believe that the snakeskin gene does not typically cross over from Y to X. That's why they are sex linked, as described. In fact, they are probably 2 totally different genes that are each sex linked. A "crossover" would be quite rare and would probably constitute a naturally occurring mutation of sorts.

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**vannel** · 26th Jan 2016, 00:30

Ohh. A supergene is thought of as a gene that defines a set of different phenotypes.

A popular one is the Moscow supergene. The Moscow is iirc thought of as having a metallic blue/black head and a solid coloured body that pretty much matches the head colour making it look like a solid coloured fish.. Although it really isn't. Thus, what you have, is a supergene that defines a collection of different phenotypes that are tightly linked.

Something like that..

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**vannel** · 26th Jan 2016, 00:48

I've always been more fascinated by colours instead of patterns, to be fair. So my knowledge of the various pattern genes is not as good. Pretty sure some other people are alot more well versed.

If you've had the chance to read up on colour make up and layers, that's another huge area to explore. For example, there are diagrams and microscopic photos of scales to explain base colours in guppies (grey, blonde, and some also consider albino to be a base colour, although it isn't strictly). Also, how colours are not just present on a single flat layer on the top epidermis, but instead stacked.

Did you also know that glass belly is actually just a lack of the silver pigment on the belly, but because of that, colours therefore are not as 'solid'.

Okaaaayyyy.. I've probably gone abit overenthusiastic on the topic.

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**Bern C** · 26th Jan 2016, 16:16

@Guppendlers~ Beautiful snakeskin hybrids!!!

Yeah.. I managed to dig out some articles on snakeskin genotype. There are actually 2 genes, snakeskin body(Ssb) & snakeskin tail(Ssb). Yup... the chances of gene crossover is very low. I not sure even after the crossover, the female will able to show the snakeskin traits or not as female seem to lack color pigmentation or something.
http://agris.fao.org/agris-search/se...rdID=SG9015057
http://www.ncbi.nlm.nih.gov/pubmed/2794473

I heard that Moscow is created from metal head, not sure true or not. So supergene means those genes that are linked or closely related? I will look into this later.
Yeah... I find the guppy color pigmentation very interesting too.. still reading about this, and over-dominant, incomplete dominant & co-dominant. It's like the oil painting pastels.

**fireblade** · 26th Jan 2016, 17:31

we should have another thread on guppy genetics

**vannel** · 26th Jan 2016, 20:29

Originally Posted by fireblade

we should have another thread on guppy genetics

Ha-ha. There was one some time ago I think. But no one really caught on.. Most people stick to line breeding their strains individually.

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**Guppendler** · 26th Jan 2016, 22:31

Talking about base color an interesting one would be Purple Body mutation making orange colorations looked pink, this body base is signature of ginga rubra and ginga sulphereus. I have never seen any of these gingas being sold at any lfs before

**vannel** · 27th Jan 2016, 06:30

From the paper written by Tanaka, the ginga strains are blonde based. The purple body mutation (Pb) is just a colour variant above the base colour itself, much like any other colour, but only affecting hybrids and only displaying on primarily the peduncle and lateral line.

Probably shouldn't be confused for being the base colour.

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