Sexual selection

Question 1

What is Sexual Selection?

Answer 1

A mode of natural selection in which members of one biological sex choose mates of the other sex to mate with, and compete with members of the same sex for access to members of the opposite sex

Question 2

Monogamy

Answer 2

one male & one female, no sexual dimorphism

Question 3

Polygamy

Answer 3

both have multiple partners

Question 4

Polyandry

Answer 4

female has multiple partners

Question 5

Polygyny

Answer 5

male has multiple partners

Question 6

How does sexual selection act?

Answer 6

Consequence is sexual dimorphism - the condition where sexes of the same species exhibit different morphological characteristics

Stronger sexual dimorphism correlated with stronger sexual selection

More predation = less dimorphism

Sexually selected traits have high variability and additive variance

Question 7

Intrasexual selection

Answer 7

Type of sexual selection that occurs when members of the same sex (usually males) compete with each other for access to mates

Polygamy has a few winners, many losers, causes intense competition between species

Fighting, mate-guarding, sperm competition, lekking

Lekking - males gather and compete, females observe and choose the best
-Costly for males

Question 8

Intersexual selection

Answer 8

Intersexual selection is a type of sexual selection where individuals of one sex choose mates based on certain traits or behaviors displayed by individuals of the opposite sex

Runaway sexual selection - evolution of ostentatious male ornamentation by persistent, directional female choice