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Related Experiment Videos

Duplex comb in the chicken: a multi-allelic trait.

R G Somes1

  • 1Department of Nutritional Sciences, University of Connecticut, Storrs 06269-4017.

The Journal of Heredity
|March 1, 1991
PubMed
Summary

Chicken comb genetics reveals at least three alleles at the duplex comb locus. The V-shaped comb is incompletely dominant over the buttercup comb, with distinct genetic expressions and penetrance.

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Area of Science:

  • Animal Genetics
  • Poultry Breeding
  • Mendelian Genetics

Background:

  • Chicken comb morphology is a key trait in poultry breeding.
  • Understanding the genetic basis of comb types, such as duplex combs, is crucial for selective breeding.
  • Previous studies have identified various comb shapes, but allelism at the duplex comb locus requires further elucidation.

Purpose of the Study:

  • To investigate the allelism at the duplex comb locus in chickens.
  • To determine the inheritance patterns and dominance relationships between different duplex comb types.
  • To propose a genetic model for duplex comb alleles.

Main Methods:

  • Crossbreeding experiments were conducted between La Flèche (V-shaped duplex comb) and Sicilian Buttercup (buttercup duplex comb) chicken breeds with single-combed breeds.
  • Phenotypic analysis of comb morphology in offspring.
  • Segregation and linkage analysis to infer allelic relationships.

Main Results:

  • The La Flèche V-shaped duplex comb is an incomplete dominant with complete penetrance and strong duplex expression.
  • The Sicilian Buttercup buttercup duplex comb is also incompletely dominant but shows reduced penetrance (32% in females) and weaker duplex expression.
  • In crosses between duplex comb types, the V-shaped comb completely dominates the buttercup comb.

Conclusions:

  • At least three alleles exist at the duplex comb locus: Dv (V-type), Dc (buttercup type), and d+ (non-duplex).
  • The Dv allele confers both comb doubling and tissue mass suppression, while Dc primarily causes comb doubling.
  • This allelic series explains the observed inheritance patterns and phenotypic variations in duplex comb morphology.

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