Lecture 12

Question 1

Coefficient of relatedness (r)

Answer 1

Measures the fraction of alleles in two individuals that are identical by decent (Inherited from the same ancestor)
-Can also be though of as the portion of genes that are shared between relatives

Question 2

Naked Mole Rats

Answer 2

• First eusocial vertebrate ever discovered
• Single queen and from one-three reproductive males are the only breeders in a colony
• Cooperative behavior that can be explained by kin selection

Question 3

Worker Bee (Females)

Answer 3

• Rarely Reproduce
• Help mother to reproduce
• die when they sting
• collect food for their nest mates
• recruit nestmates to abundant food sources by dancing

Question 4

Queen Bee

Answer 4

• One per colony
• Mates with several males (up to 12)
• Stores sperm in her spermatheca
• Fertilized eggs become females (workers or new queen)
• Unfertilized eggs become males (Drones)

Question 5

Round Dance

Answer 5

• Used to recruit foragers to food, water, resin or nest sites
• Food is Close (less than 15-100meters)

Question 6

Waggle dance

Answer 6

• Used to recruit foragers to food, water, resin or nest sites
• Communicates distance and direction
• Approx. 1 second of waggle per Km to food source

Question 7

Tremble Dance

Answer 7

-Used by returning foragers when they can’t find a receiver bee to accept regurgitated nectar

Question 8

Reciprocal Altruism

Answer 8

“I’ll scratch your back now if you scratch mine later”

• When cooperation occurs between unrelated individuals
• High likelihood of repeated encounters
• Ability to recognize cheaters and retaliate
• Benefit > Cost

Question 9

Vampire Bats

Answer 9

• Reciprocal Altruists
• Live in colonies of related and unrelated individuals
• Require blood meals
• Starve after 60 bloodless hours
• Adult females regurgitate blood to their young, other young, and each other