The early development
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The Early Development. Janay Rocha Biology Pre AP Day B, Period 2 16 April, 2012. After the first cell division. The zygote forms two cells, the developing animal is called an embryo. The embryo continues to undergo mitosis and cell division, forming a solid ball of cells.

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The Early Development

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The early development

The Early Development

Janay Rocha

Biology Pre AP

Day B, Period 2

16 April, 2012


After the first cell division

After the first cell division

  • The zygote forms two cells, the developing animal is called an embryo.

  • The embryo continues to undergo mitosis and cell division, forming a solid ball of cells.


The early development

This is a two cell human

Embryo.


The early development

This is an embryo at the 16-cell stage, when it is changed from a zygote to a morula.


The early development

  • These cells continue to divide, forming a fluid-filled ball of cells called the blastula. During these early stages of development, the number of cells increases, but the total amount of cytoplasm in the embryo remains the same as that in the original cell. Therefore, the total size of the embryo does not increase during development. The outer blastula is a single layer of cells.


The early development

  • The blastula continues to undergo cell division. Some cells move inward to form a gastrula. A gastrula is a two-cell-layer sac with an opening at one end. A gastrula looks like a double bubble, one bubble inside another bubble.


Works cited

Works Cited

  • Pictures: google.com

  • Information: McGraw Hill. Biology Textbook. April 16, 2012. Web.


The end

The End


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