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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

The graph in the Figure plots relative olfactory bulb size for pairs of closely related birds (a through m), with each pair having a species that is more active at night (nocturnal) and one that is more active during the day (diurnal). The researchers hypothesized that nocturnal birds would have larger olfactory bulbs because they need to depend on senses other than sight.

Do any of the pairs provide evidence against the hypothesis?

Explain each of your answers.

Chapter 41, Problem 2ITD, The graph in the Figure plots relative olfactory bulb size for pairs of closely related birds (a

Source: From S. Healy and T. Guilford. 1990. Olfactory-bulb size and nocturnality in birds. Evolution 44:339–346. Copyright © 1990 Wiley Publishing

Summary Introduction

To review:

Whether any of the given pairs of birds do not support the hypothesis of researchers.

Introduction:

The olfactory receptors are located in the nose of vertebrates. Olfactory bulbs are part of brain where olfactory nerves form synapses with interneurons and send signals to cerebral cortex of brain in the form of action potential. The chemical present in environment act as cues that trigger the generation of action potential in the olfactory receptors. It has been observed that the olfactory bulb is larger in case of diurnal birds.

Explanation

Given:

The following graph represents the size of olfactory bulb in different pairs of birds. The pairs of birds contain diurnal and nocturnal birds that are represented by blue and red dots, respectively.

The chemical cues get mixed with the mucous present in nose and then reaches the olfactory receptors. The olfactory receptors form synapses with interneurons in the olfactory bulbs and transmit signals to the cerebral cortex of brain...

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