Sexual Selection Flashcards
1
Q
What does natural selection cause?
A
Evolution of traits which improve survival
2
Q
What does sexual selection cause?
A
Evolution of traits which give the owner a mating advantage
3
Q
Why do males usually compete to breed?
A
Gamete size difference (cost)
Rate of reproduction
Sexually available males vs females
Females greater parental investment
4
Q
What is intra sexual selection?
A
Competition amongst own sex for members of opposite sex
E.g horns for fighting
5
Q
What is inter sexual selection?
A
Mate choice by other sex
6
Q
Why is it good to be choosy?
A
Get right species Better resources Better parental care Less harassment Offspring of better quality
7
Q
What are examples of secondary sexual characteristics?
A
songs, feathers, long tails
traits become elaborate if they co-evolve with female preference
