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4.6 process and analyse information from secondary sources to compare and describe the nature of photoreceptor cells in mammals, insects and in simple light receptors in one other animal

process and analyse information from secondary sources to compare and describe the nature of photoreceptor cells in mammals, insects and in simple light receptors in one other animal

Type of animal Example Distribution of photoreceptors Ability to perceive colour
Mammal humans located in the eye, different types of receptors; rods and cones; three types of cones are responsible for colour vision and are located more towards the centre of the retina; rods are located more towards the periphery of the eye and are best for movement detection three colour vision system
dog located in the eye; two types of cones red-green colour blind
Invertebrate bee compound eyes, hundreds off optical units called ommatidia. three colour vision but can see ultra-violet light and not red light
flatworm located in cup eyes directional information only; no colour

Here are some webpages to use as a starting point.

Human vision colour (external website) Howard Hughes Medical Institute, Chevy Chase, Maryland, USA.

Animal senses (external website) University of Washington, Seattle, Washington, USA.