Week 9- Developmental Platisicty

Question 1

Explain mixed ESS in coho salmon

Answer 1

Hook nose- migrates to ocean (big)
Jack-migrates back to river early, or stays in river (smaller)

Question 2

Life cycle of coho salmon

Answer 2

-female salmon release eggs at specific sites
- males salmon release sperm when near eggs released by female
- hook nose males fight
- jack males sneak
- proximity to eggs determines reproductive success
- small males can get closer to female (Jack)
- big males can get closer to female (hooknose)

Question 3

Explain ESS in the Ruff
Equal reproductive success?

Answer 3

Lethality associated with satallit allele
Satellites and faeders have equal/ lower mating rates than independents
Satellites and faeders have larger testes: better in sperm competition?

Question 4

What does frequency dependent selection do

Answer 4

It will equate reproductive success of two morphs/genetic strategies

Question 5

Quantative traits:
What do the letters stand for in P= G+E

Answer 5

P is phenotypic value for the trait of one individual
G is the genotyping value- the effect of the genes carried by the individual
E is the effect of environmental factors on the phenotype of the animal

Question 6

Phenotypic plasticity equation

Answer 6

P= Gx E
One genotype produces different phenotypes in response to different environmental conditions (polymorphism)

Question 7

What is the conditional strategy

Answer 7

Nutrition-sensitive plasticity
P= G xE where E is nutrition that affects individual condition, and thereby phenotype expression
Better condition then more chance of becoming a fighter