Exam 2: stickleback

Question 1

Benefits of studying Oceanic stickleback

Answer 1

Geographically uniform, living fossil of ancestor, hug population size, stable environment.

Question 2

Character polarity

Answer 2

Direction of evolutionary change.

Question 3

Ecotype

Answer 3

Similar phenotype that have evolves repeatedly and independently on similar habitats.

Question 4

Limnetic Ecotype

Answer 4

Slender, mouth and eyes positioned for feeding on plankton, closely spaced gill rakers

Question 5

Benthic ecotypes

Answer 5

Deeper-bodies, mouth large for feeding on benthic invertebrates. Short, stubby and widely spaced gill rakers.

Question 6

Limnetic

Answer 6

Deep, oligotrophic lakes with little littoral zone

Question 7

Benthic

Answer 7

Shallow, more productive with more littoral zone

Question 8

Parallel ecotypic variation

Answer 8

Populations in similar habitats have similar phenotypes. Phenotypes are genetically based. When certain ecotypes evolved repeatedly and independently.

Question 9

Adaptive radiation

Answer 9

Diversification of a population or species caused by natural selection adapting them to new environments.