Animal evolution
This presentation is the property of its rightful owner.
Sponsored Links
1 / 6

Animal Evolution PowerPoint PPT Presentation


  • 85 Views
  • Uploaded on
  • Presentation posted in: General

Animal Evolution. Precambrium Sea Multicellular Competition. Characteristics of animals. Animals are multicellular heterotrophic eukaryotes Ingestion to make inorganic chemicals Animal cells lack cell walls and are held together by proteins (collagen) Nervous Tissue and Muscle Tissue

Download Presentation

Animal Evolution

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Animal evolution

Animal Evolution

  • Precambrium Sea

  • Multicellular

  • Competition


Animal evolution

Characteristics of animals

  • Animals are multicellular heterotrophic eukaryotes

  • Ingestion to make inorganic chemicals

  • Animal cells lack cell walls and are held together by proteins (collagen)

  • Nervous Tissue and Muscle Tissue

  • Reproduce sexually with the diploid stage being dominant


Early embryonic development

Early Embryonic Development

Cleavage: mitotic division

Multiple cells combine

Blastula: hollow ball of cells

Hollow portion called Blastocoel

Embyronic Layers

Form.

Endoderm and Ectoderm


Traditional body plans

Traditional “Body Plans”

  • Major characteristics, embryonic development

  • Major branches called Grade

1. Parazoa-Eumetazoa: Formation of Tissues

2. Radiata-Bilateria:

3. Acoelomate-Pseudocoelomate-Coelomate

4. Protostome-Deuterostome:


Radiata bilateria dichotomy

Radiata-Bilateria Dichotomy

  • Bilateralism forms: Dorsal, Ventral, Anterior, Posterior

  • Cephalization: adaptation for movement.

  • Germ Layers: various layers of cells in development.

  • Ectoderm: gives rise to outer covering, CNS

  • Endoderm: innermost layer, digestive tube

  • Mesoderm: b/w other two layers, muscle and other organs

  • Diploblastic: two germ layers (radiata)

  • Triploblastic: Three germ layers (bilateria)


Protostome deuterostome dichotomy

Protostome-Deuterostome Dichotomy

Protostome: mollusks, annelida, arthropoda

Deuterostomes: Echinodermata, Chordata

  • Cleavage: division of cells,

    • Spiral Cleavage: Protostomes, Early developmental fate,

    • Radial Cleavage: Deuterostomes, indeterminate cleavage

  • Coelom Formation:

Blastophore Fate:

Protostome: blastophore forms mouth

Deuterostome: blastophore forms anus


  • Login