Question

1. how can geographic isolation lead to the formation of new species?
2. explain one way speciation could happen without physical separation.
3. how does natural selection contribute to speciation?
4. what role can genetic drift play in peripatric speciation?

match the term to the example
example
a river forms between two groups of frogs.
two bird species sing different songs.
some plants bloom in spring, others in summer.
birds from the mainland start a new population on an island.
fish in the same lake begin to feed in different areas and stop interbreeding.
term
a. behavioral isolation
b. geographic isolation
c. temporal isolation
d. peripatric speciation
e. sympatric speciation

Explanation:

• "A river forms between two groups of frogs" is an example of geographic isolation as a physical barrier (the river) separates the frog groups.
• "Two bird species sing different songs" is behavioral isolation as the different songs are a behavioral trait that prevents inter - breeding.
• "Some plants bloom in spring, others in summer" is temporal isolation as the different blooming times (a time - related factor) prevent inter - breeding.
• "Birds from the mainland start a new population on an island" is peripatric speciation where a small group (the birds on the island) forms a new population.
• "Fish in the same lake begin to feed in different areas and stop interbreeding" is sympatric speciation as speciation occurs within the same geographical area (the lake).

Answer:

• A river forms between two groups of frogs: B. Geographic isolation
• Two bird species sing different songs: A. Behavioral isolation
• Some plants bloom in spring, others in summer: C. Temporal isolation
• Birds from the mainland start a new population on an island: D. Peripatric speciation
• Fish in the same lake begin to feed in different areas and stop interbreeding: E. Sympatric speciation