This week in 206 Dr. Lloyd Sea urchin

This week in 206 Dr. Lloyd Sea urchin

This week in 206 Dr. Lloyd Sea urchin fertilization thru gastrulation.

. Chick gastrulation thru organogenesis. Fungi fertilization and sporangium developme Development Sea urchin

Deuterostome Isolecithal Holoblastic cleavage Chick Deuterostome

Telolecithal Meroblastic cleavage Fertilization cleavage Blastulation & gastrulation

Organogenesis & pattern formation Why do cells move in specific ways at specific times? How, why, and when do cells become specialized? Sea urchin body plan

1997 Chris Patton, Stanford University Fertilization Sea urchin fertilization acrosome

Cortical granules Fertilization membrane 1997 Chris Patton, Stanford University

Fertilization Holoblastic--cleaves completely through cell Isolecithal--evenly dispursed yolk.

Sea Urchin Cleavage and blastulation 3 div. 1st div. 8 cell blastula

Hatched blastula Three types of morphogenetic movements during gastrulation.

Gastrulation -2 types of morphogenetic movements. 1. Ingression of ~40 cells to form Primary mesenchyme cells (PMC) Formation of mesoderm.

Gastrulation 2. Invagination of cells at vegetal pole Forms blastopore and archenteron-primitive gut

3 germ layers ectodermskin and nervous system. mesodermbone, muscle, circ. system, internal organs. endodermstomach and guts. archenteron

2nd ingression of cells to form Secondary mesenchyme Together=mesoderm

Primary mesenchyme 2nd invagination at animal pole to form mouth Complete gastrula

Germ layers archenteron Ecto Meso Endo

Sea urchin larval development. Sea urchin larva shell

Shell membrane albumen Chick Nucleus Cytoplasm

Yolk Telolecithal-asymmetric 1st div.

2nd 3rd 4th Meroblastic cleavage-part cleavage

~100,000 cells when egg laid. Epiblast - 3 germ layers ectoderm mesoderm endoderm

Delamination Ingressionmesoderm Chick gastrulation.

Primitive streak -cells ingress -induced by hypoblast ~blastopore Notochord -induced by Hansens node

Somites -muscle, bone Embryo lifts off surface3 layersectoderm mesoderm endoderm Becomes brain

Sacs form around embryo Fresh laid egg-blastodisc 13 hour egg

24 hour chick sections 33 hour chick sections 33 hour whole mount

48 hour 72 hour

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