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Phenotype: The tail gene affects tail morphology in drakes.
Wild-type drakes have 27 to 30 caudal vertebrae, the most posterior being enlarged into a club that is contained within the tail flare.
Homozygotes for the tail kinked allele (tk/tk) have 22 to 25 caudal vertebrae, with tails that have one or more bends lacking the terminal club and flare.
Homozygotes for the short tail allele (t/t) have 13 to 15 caudal vertebrae, with short tails that curl ventrally and lack the terminal club and flare.
The three known alleles form the dominance series T > tk > t as shown in the table below.
The presumptive wild-type allele T is fully dominant to both other alleles, while the intermediate allele tk is dominant to t but recessive to T.
Phenotype Terms:
limb/digits/tail phenotype
skeleton phenotype
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