An ARS element consists of an A-T-rich region that contains discrete sites in which mutations affect origin function.

TLS Online TPP Program

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#Unit 11. Evolution and Behavior

Taxis - movement toward or away stimuli

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#Unit 11. Evolution and Behavior

Fixed action pattern - A predictable series of actions triggered by a cue, sometimes called the key stimulus.

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#Unit 11. Evolution and Behavior

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#Unit 11. Evolution and Behavior

Stimuli
Anything that can trigger a physical or Behavioral change

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#Unit 11. Evolution and Behavior

Sign stimulus (releaser)

The essential feature of a stimulus, which is necessary to elicit a response.

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#Unit 11. Evolution and Behavior

Male stickleback fish develop red colour on their ventral side in the breeding season and maintain territories. 

When a conspecific male intruder enters their territory, resident males perform an aggressive display. 

The ethologist Niko Tinbergen presented models of different shapes to territorial male stickleback fish. He found that models of any shape elicited aggressive displays, provided the ventral part of the models was coloured red.