Log in
HomeClass Notes1,200,000CA670,000

Biology 3338A Lecture Notes - Lecture 18: Imz-Ural, Gastrointestinal Tract, Regional Differentiation

16 views7 pages
coffeemoose574
9 Jul 2016
School
Western University
Department
Biology
Course
Biology 3338A
Professor
Sashko Damjanovski

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

If a cell is undergoing involution = endoderm, cells that undergo epiboly = ectoderm. Involution is driving gastrulation, epiboly is closing the ectoderm, convergent extension makes embryo longer. Roof of blastocele cavity rearranges cells so endoderm and ectoderm touch and cells migrate along roof of ectoderm, as they migrate, induction occurs- forms mesoderm. Here we"re looking at gastrulation starting at the left side of the embryo. We have our blastoceal cavity, dorsal forms on top. , and bottle cells starts to sink, when that happens you rearrange shit inside the blastocoel cavity and allow cells to interact with the wall of the blastocoel cavity. So the roof of the cavity is going to bind the wall of cavity, green binds blue. As endoderm migrate along the roof of the blastoceal induction occurs. These cells bind fibronectin through integrins and migrate across the roof of the cavity, as this is happening inductive interaction is occurring and you form mesoderm.

Get access

Grade+
$40 USD/m
Billed monthly
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
10 Verified Answers
Class+
$30 USD/m
Billed monthly
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
7 Verified Answers

Related Documents

Biology 3338A Lecture Notes - Blastula, Chordin, Notochord
pearlizard301
Biology 3338A Lecture Notes - Lecture 9: Basal Lamina, Blastocoel, Blastula
limehorse569
Biology 3338A Lecture Notes - Lecture 20: Notochord, Oviduct, Regional Differentiation
coffeemoose574

Related Questions

  1. An organism with extensive yolk, such as the chick,

A) has incompletecleavage. D)forms a blastoderm but no blastocoel.

B) has yolk evenly distributed in the egg. E) has completecleavage.

C) fails to synthesize DNA duringcleavage.

  1. Invagination

A) occurs in sea urchins.

B) forms the archenteron in echinoderms.

C) creates unique positions for new cell interactions.

D) requires unique cell movement.

E) All of the above

  1. When the blastopore dorsal lip is grafted from one frog embryoonto a second embryo, the second dorsal lip will

A) change the developmental fate of the surrounding cells.

B) change the polarity of the adjacent segments.

C) cause rapid cell division.

D) block gastrulation.

E) change the prospective potency of the surrounding cells.

  1. Gastrulation in birds differs in many ways from gastrulation infrogs. The main feature that both have in common is that

A) the neural tube forms.

B) somites are created.

C) cells from the surface of the blastocyst migrate to form thegut.

D) three germ layers are established.

E) All of the above

  1. In humans, the secondary oocyte forms:
  1. at ovulation.
  2. during telophase I.
  3. after fertilization.
  4. at birth.
  5. all of the above.

  1. In Ascaris:
  1. The secondary oocyte is fertilized.
  2. Two polar bodies are visible when the secondary oocyte is inprophase II.
  3. Both a haploid and a diploid nucleus are present in a primaryoocyte during early prophase I.
  4. Cell plates are formed during both anaphase I and anaphaseII.
  5. No correct answer is given.
  1. A gastrula is:

a. an embryo that is younger than a blastula.

b. a stage in development that has three tissue layers.

c. a type of egg that has yolk concentrated at one end of thecell.

d. an opening in the center of an early embryo.

e. something else

  1. A human cell containing 22 autosomes and one Y chromosome isa

a. somatic cell of amale b. zygote

c. somatic cell of afemale d. a sperm e. an ovum

  1. The spermatogonium is ________ , and the primary spermatocyteis __________ .

a. diploid,haploid b. haploid, diploid

c. haploid,haploid d. diploid,diploid e. triploid, diploid

  1. The first cavity formed in the rapidly dividing starfish embryois the:

a. Blastoderm. b. Archenteron.

c. Neural groove. d. Blastocoel. e. Trophoblast.