Refer to the phylogenetic tree below showing the phylogenetic relationships among eight species.Red dots indicate the appearance of derived traits. According to the phylogenetic tree, which synapomorphies unite the pigeon and the lizard?
A) Feathers
B) A gizzard
C) Keratinous scales
D) Feathers and a gizzard
E) Feathers and keratinous scales

Question

Refer to the phylogenetic tree below showing the phylogenetic relationships among eight species.Red dots indicate the appearance of derived traits.  According to the phylogenetic tree, which synapomorphies unite the pigeon and the lizard?
A) Feathers 
B) A gizzard 
C) Keratinous scales 
D) Feathers and a gizzard 
E) Feathers and keratinous scales

Quizplus · Accepted Answer

The only synapomorphy that is shared between the pigeon and the lizard is the presence of keratinous scales on their skin. Feathers and a gizzard are unique to birds, and are not present in lizards.

Refer to the Phylogenetic Tree Below Showing the Phylogenetic Relationships