Exam 2 extra

Question 1

Steps for speciation to occur

Answer 1

-Barrier to gene flow
-Selection for different traits
-Distinct evolutionary lineages
-2 species

Question 2

Why evolution is not goal orientated

Answer 2

-It is a natural process
-Random events
-Ongoing process

Question 3

Secondary contact

Answer 3

-When 2 populations have been isolated then come into contact again

Question 4

Consequences of secondary contact

Answer 4

-Hybridization: 2 populations that evolved separately interbreed
-Reverse speciation
-Induce competition

Question 5

Community

Answer 5

-A group of different species living in the same area

Question 6

Populations fluctuating

Answer 6

-Grows: resources are abundant

-Fluctuates: Around carrying capacity, food availability/environment

-Fluctuates in cycles: Predictive, predator/prey population cycle

Question 7

Humans

Answer 7

-Exponential growth
-Need to save ecosystems
-Sustainable development

Question 8

Number one threat to biodiversity

Answer 8

-Habitat loss