Melba Is One of the Unique Individuals That Has 4

 Melba is one of the unique individuals that has 4 kinds of cones. What is not true about Melba?

A) She must be female because having four kinds of cones requires two X chromosomes.
B) She has two forms of the short-wavelength cone.
C) She has two forms of the long-wavelength cone.
D) She is better at making distinctions between one color and another compared to someone with three cones.

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