Yes, but that's because you only start with one X.
Women start with two, and each cell randomly deletes one or the other redundant X chromosome. From what I'm gathering, the tetrachromatic cone is a mutant version of a normal red cone--so tetrachromats would start out with one "normal cone" X and one "mutant cone" X. Since each cell is random it should be about a 50-50 split in the eyes between cells that use the mutant cone and those that use the normal cone.
With XY, you've either got the normal red cone or the mutant red cone, but no chance of getting both.
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timeasmymeasure
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Date: 2009-01-23 10:16 pm (UTC)Women start with two, and each cell randomly deletes one or the other redundant X chromosome. From what I'm gathering, the tetrachromatic cone is a mutant version of a normal red cone--so tetrachromats would start out with one "normal cone" X and one "mutant cone" X. Since each cell is random it should be about a 50-50 split in the eyes between cells that use the mutant cone and those that use the normal cone.
With XY, you've either got the normal red cone or the mutant red cone, but no chance of getting both.