IB Biology SL A4.1.4 Evidence From Homologous Structures Questions

Homologous structures share a common ancestry even when their functions differ. Vertebrate pentadactyl limbs provide evidence for divergent evolution and adaptive radiation.

Exam points

Explain that homologous structures share a common ancestry even when their functions differ.
Use vertebrate pentadactyl limbs as evidence for divergent evolution and adaptive radiation.

[Maximum number: 2]

The Chinese pangolin (Manis pentadactyla) is a critically endangered species that has declined in numbers by 80 % since 2000. It inhabits both forest and grassland, where it uses long, powerful claws to open ant and termite nests and ingests the insects using a long, sticky tongue.

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Outline evidence for evolution from the limbs of mammals such as pangolins.

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a	pentadactyl;
b	homologous with limbs of other vertebrates;
c	due to common ancestry;
d	adaptation;

IB Biology SL A4.1.4 Evidence From Homologous Structures Questions question 1