Answered: An experiment was carried out to…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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An experiment was carried out to investigate proximate mechanisms of behavioural phase change in the locust Locusta fictiva (Figure 2 below). Solitarious locusts were injected with XDA, a dopamine receptor antagonist, either 1 h before or immediately after crowding them for 4 h (N=30 each). A control group of solitarious locusts received a saline injection 1 h before crowding (N=30). Locusts of all three groups were then observed in a behavioural arena to determine their probability of gregariousness (Pgreg). Briefly describe the result and discuss what conclusions you can draw about the proximate mechanism of phase change in this species.

d
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1.00
0.75
0.50
0.25
0
T
O
O
HO
Saline XDA
XDA
before before
after
crowding crowding crowding
Injection treatment
Figure 2. The effect of injecting the dopamine receptor antagonist XDA, or a saline
control, on the probability of gregariousness (Pgreg) in Locusta fictiva. N = 30 per
treatment group.

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