ND - Colour Vision Disorders I - Week 6

Question 1

Compare a normal trichromat to an anomalous trichromat, as well as dichromats when completing colour matching.

Answer 1

Trichromats (both kinds) need three primaries to match another colour when colour matching
But anomalous trichromats do not make the same matches to normals
They will often reject colour matches made by normals
Dichromats will often accept normal matches

Question 2

What is the genetic mode of inheritance for anomalous trichromacy?

Answer 2

Sex-linked recessive

Question 3

Compared to normals, what is saturation like in anomalous trichromats?

Answer 3

Looks desaturated

Question 4

What four inferences can be made about colour perceptions of anomalous trichromats compared to normals?

Answer 4

They see metamers differently
They see feer colours
Saturated colours appear desaturated
PA have reduced luminosity to red

Question 5

How do deuteranomalous trichromats generally make matches with yellow?

Answer 5

By adding more green compared to normal

Question 6

How do protananomalous trichromats generally make matches with yellow?

Answer 6

By adding more red compared to normal

Question 7

hat four things can render an opsin gene abnormal?

Answer 7

Completely missing from the gene array
Point mutations
Major sequence deletions
Unequal crossing over

Question 8

During meiosis, hat makes a misalignment mistake much more likely?

Answer 8

Multiple M copies

Question 9

What happens to spectral sensitivity in protanomals vs deuteranomals?

Answer 9

Protanomals - red peak shifts towards the green

Deuteranomals - green peak shifts towards the red