Question 1

What are the main types of evidence for evolution covered in the IB DP Biology curriculum?

Accepted Answer

The IB DP Biology curriculum highlights several key types of evidence for evolution, including fossil records, comparative anatomy, molecular biology, and biogeography. Fossil records show the progression of life forms over time. Comparative anatomy examines similarities in the structure of different organisms, such as homologous structures. Molecular biology looks at DNA and protein similarities, while biogeography studies the distribution of species across the planet.

Question 2

How do fossil records serve as evidence for evolution?

Accepted Answer

Fossil records provide chronological evidence of how species have changed over time. They show a sequence of evolutionary changes, with older fossils found in deeper geological layers and newer ones in upper layers. Transitional fossils, which exhibit traits common to both ancestral and derived species, are particularly important as they illustrate the gradual changes that have occurred over millions of years.

Question 3

What role does comparative anatomy play in supporting the theory of evolution?

Accepted Answer

Comparative anatomy supports the theory of evolution by revealing structural similarities between different species. Homologous structures, such as the limb bones of vertebrates, suggest a common ancestry. These structures may serve different functions in modern species but share a similar underlying anatomy, indicating evolutionary divergence from a common ancestor.

Question 4

How does molecular biology provide evidence for evolution?

Accepted Answer

Molecular biology provides evidence for evolution through the analysis of DNA and protein sequences. Similarities in genetic material across different species suggest a shared evolutionary history. The more closely related two species are, the more similar their DNA sequences tend to be. This molecular evidence complements findings from fossil records and comparative anatomy, reinforcing the theory of common descent.

Question 5

Why is biogeography considered evidence for evolution?

Accepted Answer

Biogeography, the study of the distribution of species and ecosystems in geographic space and through geological time, provides evidence for evolution by showing how species have adapted to different environments. The unique distribution patterns of species, such as those found on islands, can often be explained by historical events like continental drift and natural selection, supporting the idea of species evolving over time to fit their habitats.

Evidence for evolution

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