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AP® Biology

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Ancestral Trait

APBIO-9E7ME1

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 among 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.

Based on the chart, what is an ancestral trait for all of these species?

A

20 cm head size.

B

Blue beak color.

C

Red eyes.

D

Three eyes.