Summary 1. It is considered that ptosis and ptosis with epicanthus are probably manifestations of the same dominant autosomal gene with high penetrance. 2. There is no significant difference in the proportion of affected males and females in sibships with one parent affected. The apparent difference in sex incidence of the condition is due to the high sex ratio observed in such sibships. 3. An appeal is made for the collection of unselected pedigree material for use in genetic studies.
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Rank et al. (1959) studied this question.
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