From page 6 of thread:
"Here are two blips on crested genes:
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.
That is from Wikipedia...
And:
The domesticated Crested Duck breed is a type of domestic duck breed of rather large size and weight with beautiful plumage.
The Crested duck breed is distantly related to other ducks and is directly descended from the Mallard duck breed.
Crested Ducks have naturally-deformed skulls that give it a physical "crest" on the top of its head. Crests should be large and sit symmetrically on the duck's head.
The crest on Crested Ducks arose from a genetic mutation specifically bred into the bird by duck breeders.
****Interestingly enough, a quarter of all Crested Ducks die when they hatch because the crest is not properly formed and leaves the duckling's brain fatally exposed.****
Another quarter of all Crested ducklings are born without a crest.
Only half of all Crested ducklings hatched from eggs procured by breeding two Crested ducks will have the crested genes passed down to them.
From duckhobby.com"
Surely these were not Crested Call Ducks?! What were they?
"Here are two blips on crested genes:
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.
That is from Wikipedia...
And:
The domesticated Crested Duck breed is a type of domestic duck breed of rather large size and weight with beautiful plumage.
The Crested duck breed is distantly related to other ducks and is directly descended from the Mallard duck breed.
Crested Ducks have naturally-deformed skulls that give it a physical "crest" on the top of its head. Crests should be large and sit symmetrically on the duck's head.
The crest on Crested Ducks arose from a genetic mutation specifically bred into the bird by duck breeders.
****Interestingly enough, a quarter of all Crested Ducks die when they hatch because the crest is not properly formed and leaves the duckling's brain fatally exposed.****
Another quarter of all Crested ducklings are born without a crest.
Only half of all Crested ducklings hatched from eggs procured by breeding two Crested ducks will have the crested genes passed down to them.
From duckhobby.com"
Surely these were not Crested Call Ducks?! What were they?
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