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AP® Biology

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Trait Changes

APBIO-OENBJQ

A student is comparing traits for five related bird species. She makes a chart and records data for four different traits. She then uses the chart to make a cladogram showing her hypothesized relationships between the species.

1 2 3 4 5
Head Size 20 cm 20 cm 20 cm 20 cm 20 cm
Beak Color Black Blue Blue Black Black
Eye Color Black Black Red Red Red
Eye Number 2 2 2 2 3

Created for Albert.io. Copyright 2016. All rights reserved.

What occurred at point C on the cladogram?

A

Head size increased.

B

Red eyes developed.

C

The beak color of the common ancestor of Species 4 and 5 changed from blue to black.

D

The descendants of Species 3 diverged to become Species 4 and Species 5.