Ch10-Evolution of Reproductive Behavior

Question 1

Define: satellite male.

Answer 1

A male that waits near another male to intercept females drawn to the signals produced by the other male or attracted by the resources defended by the other male

Question 2

Describe two explanations of alpha, beta and gamma sponge isopod

Answer 2

1) traces to genetic differences, mean reproductive success is about equal (true to sponge isopod)
2) behavior differences traced to environmental differences, mean reproductive success not equal

Question 3

Describe the four theories on why extreme male ornamentation and striking courtship displays have evolved in species which males provide no material benefits to their mate.

Answer 3

1. Healthy mate-females and offspring avoid disease and parasites
2. Good genes-offspring inherit viability from father
3. Runaway selection- sons inherit sexually attractive traits, daughters inherit majority mate preference
4. Chaseaway selection- no benefit received by female, exploits preexisting sensory biases