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:

• For "A river forms between two groups of frogs": Geographic isolation occurs when a physical barrier (like a river) separates populations.
• For "Two bird species sing different songs": Behavioral isolation as different mating behaviors (song - singing) prevent inter - breeding.
• For "Some plants bloom in spring, others in summer": Temporal isolation due to different blooming times (temporal = time - related).
• For "Birds from the mainland start a new population on an island": Peripatric speciation where a small population (from the mainland) colonizes a new area (island).
• For "Fish in the same lake begin to feed in different areas and stop interbreeding": Sympatric speciation as speciation occurs in the same geographical area (lake) due to ecological differences (feeding areas).

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