Crested duck (breed)

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Crested duck in the harbor of Camden, Maine.

The domestic Crested Duck is a duck breed descended from the Mallard. It has its appearance because it is heterozygous for a genetic mutation causing a deformity of the skull. As a result, when a pair of crested ducks breed, the young sort out in the usual 1-2-1 ratio:-

  • 25% are homozygous for the normal allele of this gene and so have no crest and if bred together their offspring will never have a crest.
  • 50% are heterozygous for this gene and hatch with a crest of varying sizes.
  • 25% are homozygous for the crested allele of this gene and die from exposed brain without hatching, as it is lethal in homozygous form.

If a crested duck and a non-crested duck breed together, the resulting ducklings would be expected to be 50% crested and 50% non-crested.

Approximate weight[edit]

Drake 3.2 kilograms (7.1 lb)
Duck 2.7 kilograms (6.0 lb)

Miniature Crested

Drake 1.3 kilograms (2.9 lb)
Duck 0.9 kilograms (2.0 lb)

See also[edit]

External links[edit]