Round 6: 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 Sacks. (-5[1])By analyzing Homeric epithets, William Gladstone dubiously concluded (10[1])that the Ancient Greeks had (10[1])this trait. (10[3])Mark (-5[1])Zuckerberg’s possession (-5[1])of a form of this trait partly inspired Facebook’s logo. This trait was historically called Daltonism in reference to John Dalton, who had a form of it called deuteranopia. (10[2])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? ■END■ (10[1])

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