Phenotype: The forelimbless gene affects the development of the forelimbs in drakes.
Homozygotes (fl/fl) lack external forelimbs entirely. The skeleton of forelimbless drakes shows a vestigial ventral shoulder but no trace of limb bones.
Selective breeding of the Swift Steel forelimbless breed demonstrated that an unknown number of modifier genes increases compensatory muscle development of the wing muscles,
improving flight ability over wild type.
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| Fl/* | fl/fl |
Phenotype Terms:
limb/digits/tail phenotype
skeleton phenotype
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