Round 4: Tossup 18

Studies of this trait in response to an event in Lagerlunda led Frithiof Holmgren to develop his namesake wool. A book titled for this trait, which analyzes both lytico-bodig disease in Guam and the prevalence of this trait on the Pingelap Atoll, is by Oliver (10[1])Sacks. By analyzing Homeric epithets, William Gladstone dubiously concluded that the Ancient Greeks (10[1])had this trait. (10[1])Mark Zuckerberg’s (10[1])possession of a form of this trait partly inspired (10[1])Facebook’s (10[1])logo. This trait (10[1])was historically called (-5[1])Daltonism in reference to John Dalton, who had a form (10[1])of it called (10[1])deuteranopia. This trait can be detected via an Ishihara test, in which a number is written in a circle of dots. For 10 points, what trait that can be caused by missing or deficient cone cells includes the congenital “red–green” form? (10[1])■END■

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