A case of leg-colour asymmetry in the fowl
AnF1 hen out of the sex-linked mating Light Sussex ♀ × Rhode Island Red ♂ had legs of different colours, the right showing the dominant white, the left the allelomorphic recessive yellow. It is suggested that this regional expression of a recessive in a heterozygote is due to the loss of a part of an autosome during the second cleavage division.
Six other somewhat similar cases previously recorded and described as instances of either non-disjunction or gene mutation are discussed. The suggestion is hazarded that all of them can be regarded as examples of the loss of a whole autosome or of a part thereof.
Volume 100, 2021
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