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Normal and Defective Colour Vision$
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John D. Mollon, Joel Pokorny, and Ken Knoblauch

Print publication date: 2003

Print ISBN-13: 9780198525301

Published to Oxford Scholarship Online: April 2010

DOI: 10.1093/acprof:oso/9780198525301.001.0001

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Hybrid Pigment Genes, Dichromacy, and Anomalous Trichromacy

Hybrid Pigment Genes, Dichromacy, and Anomalous Trichromacy

Chapter:
(p.307) Chapter 32 Hybrid Pigment Genes, Dichromacy, and Anomalous Trichromacy
Source:
Normal and Defective Colour Vision
Author(s):

Wolfgang Jagla

Tanja Breitsprecher

Itala Kucsera

Gyula Kovacs

Bernd Wissinger

Samir S. Deeb

Lindsay T. Sharpe

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198525301.003.0032

This chapter determines the variability in genotype among anomalous trichromats and dichromats, and correlates this to their colour vision phenotype. It shows that the severity of anomalous trichromacy roughly correlates with the estimated spectral separation between the normal and the hybrid pigment. However, considerable phenotypic variability is associated with any given phenotype. The variation found with L2M3 or M3L4-hybrid genes is greater than that found with other hybrids, and cannot merely be associated with coding sequence differences in exon 2. These findings underscore an important issue in colour vision: how spectral differences between two photopigments actually translate to colour discrimination performance, and about how other retinal and cortical factors act upon photopigment differences and influence discrimination.

Keywords:   genotype, trichromats, dichromats, colour vision, anomalous trichromacy

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