Development lab
This presentation is the property of its rightful owner.
Sponsored Links
1 / 15

Development Lab PowerPoint PPT Presentation


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

Development Lab. Biology 113. Yolk Distribution. Isolecithal Telolecithal. Holoblastic versus Meroblastic cleavage. Holoblastic cleavage , the complete division of the egg occurs in species whose eggs have little or moderate amounts of yolk, such as sea urchins and frogs

Download Presentation

Development Lab

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


Development lab

Development Lab

Biology 113


Yolk distribution

Yolk Distribution

  • Isolecithal

  • Telolecithal


Holoblastic versus meroblastic cleavage

Holoblastic versus Meroblastic cleavage

  • Holoblastic cleavage, the complete division of the egg occurs in species whose eggs have little or moderate amounts of yolk, such as sea urchins and frogs

  • Meroblastic cleavage, incomplete division of the egg occurs in species with yolk-rich eggs, such as reptiles and birds


Gastrulation

Gastrulation


Neurulation

Neurulation


Sea star development

Sea Star Development

  • Identifiable stages are:

  • ovum, an unfertilized egg; nucleus and nucleolus are visible

  • zygote, a fertilized egg (diploid); the nucleus is not visible

  • 2 cells, the product of mitosis of the zygote, cells size is halved

  • 4 cells

  • 8 cells


Sea star development1

Sea Star Development

  • Identifiable stages are:

  • morula (like a compact cluster of grapes)

  • blastula, a hollow ball of cells—early, middle, and late stages are determined by cell size, which gets smaller with each round of mitosis


Sea star development2

Sea Star Development

Gastrula in which the surface pushes into the interior at a point called the blastopore to form a tube that will become the digestive system.

In a gastrula the cells on the outside are ectoderm, those lining the inner tube are endoderm, and cells that migrate and multiply between these layers will become the mesoderm.


Unincubated chicken egg

Unincubated Chicken egg


24 hr chick neurulation

24 hr chick (neurulation)


48 hr chick

48-hr Chick


56 hr chick

56-hr Chick


96 hr chick

96-hr Chick


Fetal membranes of the chick

Fetal Membranes of the Chick


  • Login