OMIA:001890-32482 : Male body size/courtship behaviour in Xiphophorus nigrensis (Panuco swordtail)

In other species: Perugia's limia , ruff

Categories: Reproductive system phene

Possibly relevant human trait(s) and/or gene(s) (MIM number): 155555 (gene)

Links to MONDO diseases: No links.

Mendelian trait/disorder: yes

Mode of inheritance: Y-linked

Considered a defect: no

Key variant known: no

Inheritance: As summarised by Ryan et al. (1992), Kallman (1984, 1989) reported that "Much of the variation in size is due to a genetic polymorphism at the pituitary (P) locus . . . Males have one of three alleles at the Y-linked P locus (s, I, and L), and s is fixed on the X chromosome. Males with the Y-s allele mature early at a body size less than 26 mm; males with the Y-I allele mature in an intermediate amount of time at an intermediate size, 26-32 mm; and males of the Y-L genotype take longer to mature and do so at a larger size, more than 31 mm."

Genetic engineering: Unknown
Have human generated variants been created, e.g. through genetic engineering and gene editing

Cite this entry

Nicholas, F. W., Tammen, I., & Sydney Informatics Hub. (2020). OMIA:001890-32482: Online Mendelian Inheritance in Animals (OMIA) [dataset].


Note: the references are listed in reverse chronological order (from the most recent year to the earliest year), and alphabetically by first author within a year.

1992 Ryan, M.J., Pease, C.M., Morris, M.R. :
A Genetic Polymorphism in the Swordtail Xiphophorus nigrensis: Testing the Prediction of Equal Fitnesses. American Naturalist 139(1):21-31, 1992.
1989 Kallman, K. D. :
Genetic control of size at maturity in Xiphophorus. in G. K. Meffe and F. F. Snelson, eds. Ecology and evolution of livebearing fishes (Poeciliidae). Prentice-Hall, Englewood Cliffs, N.J :163-184, 1989.
Zimmerer, E. J., Kallman, K. D. :
Genetic-basis for alternative reproductive tactics in the pygmy swordtail, Xiphophorus nigrensis. Evolution 43:1298−1307 , 1989.
1984 Kallman, K. D. :
A new look at sex determination in poeciliid fishes. in B. J. Turner, ed. Evolutionary genetics of fishes. Plenum, New York. :95-171, 1984.

Edit History

  • Created by Frank Nicholas on 23 Nov 2013
  • Changed by Frank Nicholas on 15 May 2020