Evolution Flashcards
1
Q
Birds as vertebrates
A
Backbone with ribs
Skull and jaws
Paired appendages
Closed circulatory system
2
Q
Birds as amniotes
A
Amniotic egg
Keratinized (waterproof) skin
3
Q
Birds as reptiles
A
One occipital condyle (neck, head bone) One middle ear bone Composite lower jaw Scales, egg teeth Nucleated RBC Uncinate Processes No skin glands ZW sex determination
4
Q
Which reptiles are modern birds most closely related
A
Alligators and crocodiles
5
Q
Birds don’t have ___ but they have the genes to make them
A
Teeth (thecodont)
6
Q
Birds and alligators share
A
Thecodont teeth No hemipenis Preorbital and mandibular fanestrea Parental care Vocalization
7
Q
How birds are different from other reptiles
A
Endothermic
4-chambered heart
Feathers
8
Q
Avian survivors of the K-Pg boundary (asteroid) were
A
Small, ground dwelling, granivores
9
Q
Asteroid impact may have temporarily sped up
A
Molecular clock
10
Q
Feather color
A
Melanosomes
