DB Chapter 9: Early development in sea urchins at Hochschule Bonn-Rhein-Sieg

Flashcards and summaries for DB Chapter 9: Early development in sea urchins at the Hochschule Bonn-Rhein-Sieg

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Study with flashcards and summaries for the course DB Chapter 9: Early development in sea urchins at the Hochschule Bonn-Rhein-Sieg

Exemplary flashcards for DB Chapter 9: Early development in sea urchins at the Hochschule Bonn-Rhein-Sieg on StudySmarter:

What type of cleavage occurs in the development of the sea urchin? 

Exemplary flashcards for DB Chapter 9: Early development in sea urchins at the Hochschule Bonn-Rhein-Sieg on StudySmarter:

Of how many cells does the blastula stage of the sea urchin consist and after which cleavage is it reached? 

Exemplary flashcards for DB Chapter 9: Early development in sea urchins at the Hochschule Bonn-Rhein-Sieg on StudySmarter:

In the blastula stage of the sea urchin, each cell is in contact with the blastocoel

Exemplary flashcards for DB Chapter 9: Early development in sea urchins at the Hochschule Bonn-Rhein-Sieg on StudySmarter:

In the blastula stage of the sea urchin, cells are connected via _______ ? 

Exemplary flashcards for DB Chapter 9: Early development in sea urchins at the Hochschule Bonn-Rhein-Sieg on StudySmarter:

How many cell layers thick is the blastula of the sea urchin until 9th division? 

Exemplary flashcards for DB Chapter 9: Early development in sea urchins at the Hochschule Bonn-Rhein-Sieg on StudySmarter:

What happens with the fertilisation envelope in the end of the cleavages? 

Exemplary flashcards for DB Chapter 9: Early development in sea urchins at the Hochschule Bonn-Rhein-Sieg on StudySmarter:

Which are the first cells that are specified

Exemplary flashcards for DB Chapter 9: Early development in sea urchins at the Hochschule Bonn-Rhein-Sieg on StudySmarter:

Which germ layer are the large micromeres determined to become? How does this happen? 

Exemplary flashcards for DB Chapter 9: Early development in sea urchins at the Hochschule Bonn-Rhein-Sieg on StudySmarter:

How is it possible, that the neighboring cells of the large micromeres become endoderm

Exemplary flashcards for DB Chapter 9: Early development in sea urchins at the Hochschule Bonn-Rhein-Sieg on StudySmarter:

The large micromeres are able to induce a normal larval development of the animal half of the embryo

Exemplary flashcards for DB Chapter 9: Early development in sea urchins at the Hochschule Bonn-Rhein-Sieg on StudySmarter:

Transplanted large micromeres are able to induce a second site of gastrulation

Exemplary flashcards for DB Chapter 9: Early development in sea urchins at the Hochschule Bonn-Rhein-Sieg on StudySmarter:

Where is "disheveled" localized? 

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Exemplary flashcards for DB Chapter 9: Early development in sea urchins at the Hochschule Bonn-Rhein-Sieg on StudySmarter:

DB Chapter 9: Early development in sea urchins

What type of cleavage occurs in the development of the sea urchin? 

Radial holoblastic cleavage

DB Chapter 9: Early development in sea urchins

Of how many cells does the blastula stage of the sea urchin consist and after which cleavage is it reached? 

It is reached after the seventh cleavage. The embyro now consists of 120 cells. 

DB Chapter 9: Early development in sea urchins

In the blastula stage of the sea urchin, each cell is in contact with the blastocoel

Right. 

DB Chapter 9: Early development in sea urchins

In the blastula stage of the sea urchin, cells are connected via _______ ? 

desmosomes

DB Chapter 9: Early development in sea urchins

How many cell layers thick is the blastula of the sea urchin until 9th division? 

1 cell layer thick 

DB Chapter 9: Early development in sea urchins

What happens with the fertilisation envelope in the end of the cleavages? 

Cells on the animal pole secrete an enzyme that digests the fertilisation envelope.

DB Chapter 9: Early development in sea urchins

Which are the first cells that are specified

Micromeres

DB Chapter 9: Early development in sea urchins

Which germ layer are the large micromeres determined to become? How does this happen? 

The cells are determined to become skeletogenic mesenchyme. This is done by maternal factors (desheveled, ß-catenin) that were deposit on the vegetal pole of the egg. 

DB Chapter 9: Early development in sea urchins

How is it possible, that the neighboring cells of the large micromeres become endoderm

The large micromeres produce paracrine and juxtacrine factors that induce the neighboring cells to become ectoderm. 

DB Chapter 9: Early development in sea urchins

The large micromeres are able to induce a normal larval development of the animal half of the embryo

Right 

DB Chapter 9: Early development in sea urchins

Transplanted large micromeres are able to induce a second site of gastrulation

Right. 

DB Chapter 9: Early development in sea urchins

Where is "disheveled" localized? 

On the vegetal pole

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