Bios 224 Midterm Exam

SUBSCRIBE

Bios 224 Midterm Exam

• How many known animal species are there on earth?

–Answer Over 1 million

• Clades

–Answer monophyletic groups that share a common ancestor

• Characteristics of animals

–Answer Multicellular, eukaryotic heterotrophs, lack cell walls, motile, reproduces

• Protosomes have cleavage.

–Answer spiral

• deuterostomes have cleavage

–Answer radial

• Zygotes develop into a compacts mass of cells called

–Answer morula

• Gastrulation begins at the

–Answer vehetal pole

• Germ Layers

–Answer ectoderm, mesoderm, endoderm

• Ectoderm

–Answer skin and nervous system 1 / 2

SUBSCRIBE

• Endoderm

–Answer digestive tract

• Mesoderm

–Answer muscle and skeleton

• Protosome's characteristics

–Answer

• determinate cleavage
• mouth develops from blastopore
• Mesoderm differentiates near blastopore
• Schizocoelom
• Deuterostomes characteristics

–Answer

• indeterminate cleavage
• mouth develops from secondary opening
• mesoderm originates from out pocketing of the archenteron
• enterocoelom
• Animal body plans are influenced by

–Answer

• embryonic development pattern
• germ cell layers
• body symmetry
• body cavity type
• radial symmetry

–Answer Symmetry about a central axis.

• bilateral symmertry

–Answer

• / 2