Is congenital ptosis of the eyelid a dominate trait or is it a recessive trait?

Dominant trait: Blepharoptosis can be familial, transmitted as a dominant trait.

Congenital ptosis: Although some cases of congenital ptosis (CP) have been mapped to certain abnormal genes and display autosomal dominant genetics (50% chance of passing to child), the vast majority of cases are sporadic. There are only 2 large studies on the incidence of cp, the risk of a child being born with CP is 1:552 - 1:842 live births.