Darwin’s Finches: Evolution, Adaptations, and Speciation

What are Darwin's finches?

Small birds from the Galápagos Islands with different beak shapes.

Why are Darwin's finches important?

They provide evidence for evolution by natural selection.

What is variation within a species?

Differences between individuals of the same species, such as different beak sizes and shapes in finches.

What are selection pressures?

Environmental factors that affect survival.

How do selection pressures affect finches?

Food type acts as a selection pressure by favouring certain beak shapes.

What are the steps of natural selection?

Variation exists → competition for resources → some survive better → they reproduce → traits are passed on → population changes over time.

What are adaptations?

Traits that help survival.

What are the types of adaptations?

Structural (beak shape), behavioural (feeding habits), and physiological (body processes).

How does isolation lead to speciation?

Populations become separated and cannot breed, leading to different adaptations and new species.

What is adaptive radiation?

When one species evolves into many different species adapted to different environments or niches.

What happened in the Daphne Major drought study?

During drought, only hard seeds were available, leading to survival of finches with larger beaks.

What evidence supports evolution in finches?

Observations of change, long-term data on beak size, and genetic similarities showing a common ancestor.

Why are Darwin's finches still important today?

They show evolution in real time and help scientists understand biodiversity and speciation.