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Genetics Index

Chromosomes
Meiosis
Meiosis: Crossing over
Mitosis and Meiosis
Introduction to Mendelian Genetics
Test Cross
Codominance
Multiple Alleles
Pedigree Charts
Twin Studies
The dihybrid cross
Dihybrid Cross : Test Cross
Autosomal Linkage
The Genetic Diagram for Linked Genes
Calculating the cross over value using a test cross
Sex determination and sex linkage
Sex linkage
Genetic diagram for sex linked genes
Blood Clotting and Haemophilia
Genetic Modification
Cloning Animals
Cloning Plants

Topic Chapters Index

 

The structure of the retina

The structure of the retina

 

 

GENETICS

Custom Search

The Retina and Daltonism

Photoreception, the Retina and Colourblindness

 

Features

Colour Vision

Monochrome Vision

Photoreceptors

CONES:
red sensitive 560nm
green sensitive 530nm
blue sensitive 420nm

RODS: max. sensitivity 505nm

Distribution

Concentrated in the fovea

Widely spread over whole retina, absent from fovea.

Pigments

3 proteins controlled by 3 genes.
Red and green pigments sex linked.
Blue pigment autosomal (Chr.7)

Rhodopsin = Retinol (Vit A) + Opsin (a protein).
Also called visual purple

Bleaching

Slow

Fast (very sensitive)

Regeneration

Slow (after images in bright light, complementary colours)

Fast

Use

Daylight vision


Light adaptation 5 min

Night vision
Dark adaptation 20 min or wear red goggles!

 

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