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Genetica | Vol.26, Issue.1 | | Pages 415-429
A hereditary lethal abnormality of the beak in Barnevelders
In 1951 an examination of dead embryos from a strain of Barnevelder fowl disclosed an abnormality of the beak, a description of which had not yet appeared in literature. The typical malformation of the beak—upper beak curling upwards, lower beak downwards—suggested the name 
Donald Duck for these embryos. Analysis of material in hand resulted in the abnormality being simple autosomal recessive.For the recessive gene the symbol
dck is proposed.
Original Text (This is the original text for your reference.)
A hereditary lethal abnormality of the beak in Barnevelders
In 1951 an examination of dead embryos from a strain of Barnevelder fowl disclosed an abnormality of the beak, a description of which had not yet appeared in literature. The typical malformation of the beak—upper beak curling upwards, lower beak downwards—suggested the name Donald Duck for these embryos. Analysis of material in hand resulted in the abnormality being simple autosomal recessive.For the recessive gene the symbol
dck is proposed.
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