Topic 20 Flashcards
1
Q
Animal’s Protist Ancestor
A
Choanoflagellate protists
-flagellated eukaryotes, small, unicellular, heterotrophic
Similarities in Cell morphology, DNA sequence homology and unique cell traits only in animals
2
Q
Evolution of Multicellularity
A
Independent evolution in mutiple lineages
3
Q
Benefits of Multicellularity
A
- cell specialization
- increased size/complexity
- longer lifespans
- enhanced defence against predation
4
Q
Significance of Cambrian Explosion
A
Significant diversification of bilateral animal evoltuon
- Evolution of predation
- Neoproterozoic Oxygenation Event
- Evolution of Hox gens (control the body plan of animals)
5
Q
Invertebrate Diversity
A
95% of known animal species that can be microscopic to giants
Anatomical classification of having no backbone and is paraphyletic
NOT A CLADE
Clades: Metazoa, Eumetazoa, and Bilateria
