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Doubletail Genetics


Sherolyn-Basement Bettas

This tail type has a few typical characteristics: (1) the caudal consists out of two lobes, (2) the dorsal has twice as much rays than the dorsal of a normal singletail betta and (3) a slightly shorter body length. The ideal doubletail has is symmetrical and has two equal tail lobes with a nice split which extends to the basis of the tail. The doubletail trait can be found in betas of any tail type and shape. For instance it can be seen in VT, D, SD, HM (DTHM = fullmoon) and CT. The double tail gene is intermediary inherited. This means that singletail bettas which are carrier of the DT gene most of the time already show a bigger dorsal (with more rays) which gives a fuller appearance. 

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Platinum DT male

Doubletail genetics
A normal singletail betta is represented by: DTDT
A doubletail betta is homozygous for the doubletail gene (DT) and is represented by: dtdt 
A singletail betta which is carrier for the doubletail gen is then represented by: DTdt

Doubletail x normal
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100% doubletail-geno (DTdt) 

Doubletail-geno x doubletail-geno
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25% doubletail (dtdt) 
50% doubletail-geno (DTdt) 
25% normal (DTDT) 

Doubletail x doubletail
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100% doubletail (dtdt) 

Doubletail-geno x doubletail
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50% doubletail (dtdt) 
50% doubletail-geno (DTdt) 

Here some general information about doubletail genetics and faults. 

According to the IBC standard, Doubletail bettas are expected to differ in several ways from the singletails: 

Quote:

1. Possess two distinct “tails” or caudal lobes instead of one, with a complete separation to the base of the caudal peduncle.
2. Possess a wider caudal peduncle to support the double lobes.
3. Possess a larger dorsal fin, nearly the size of the anal fin.
4. Their bodies are usually more “chunky” and often a bit shorter.
5. Bends in the caudal peduncle are expressed to a varying degree in almost all doubletail bettas. These are more easily noticed when viewing the fish from above. Easily seen bends should be faulted; if the bend is not excessive when viewed from above, the fish should not be penalized.

The doubletail trait can be found in betas of any tail type and shape. For instance it can be seen in VT, D, SD, HM (DTHM = fullmoon) and CT. The double tail gene is recessive (or actually intermediar), but singletail bettas which are carrier of the DT gene most of the time already show a bigger dorsal (with more rays) which gives a fuller appearance. 

Examples of faults in doubletail bettas:

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Uneven taillobes

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Crooked spine
Source: - http://www.bettasonli.com

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Deformed body
Source: - http://www.bettasonli.com

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Fused lobes
Source: - http://www.bettasonli.com

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Fused fin





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