WHAT IS LIFE? GDE.TO BIOLOGY W/PHYSIO.
WHAT IS LIFE? GDE.TO BIOLOGY W/PHYSIO.
5th Edition
ISBN: 9781319272531
Author: PHELAN
Publisher: MAC HIGHER
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Chapter 25, Problem 11MC
Summary Introduction

Introduction:

The reproductive activities of male songbirds–activities such as courting mates and securing their territory–are affected by testosterone.

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Make guarding is a reproductive tactic that functions to directly:  A. Increase the number of males to which a male has access. B. Reduce the males paternity uncertainty. C. Increase male reproductive output. D. Reduce the females fitness.  
Which of the following is NOT likely to be a result of a skewed operational sex ratio? A. A goby fish cannibalizing some of its own eggs. B. The extended head of a stalk-eyed fly. C. Female seahorses fighting over egg space in a male’s pouch. D. Male bighorn sheep butting heads.
Which of these situations offers the lowest “opportunity for selection” for males? A. Females choose mates with a fancy ornament. B. Every female chooses one male to mate with for life. C. Locations that females need access to in order to reproduce are rare. D. Males fight each other for access to groups of females.
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