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15 Cards in this Set
- Front
- Back
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What is an animal? |
A multicellular, heterotrophic eukaryote with tissues that develop from embryonic layers. |
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What are the 6 unique characteristics of animals? |
1. They are multicellular. 2. They are heterotrophic- they eat other things. 3. They ingest food. 4. They lack cell walls. 5. Their cells are organized into tissues. 6. They reproduce- mostly sexually. |
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Why are animals heterotrophic? |
They cannot construct all of their own organic molecules, so they ingest them and use enzymes within their bodies to digest them. |
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What are the two, unique types of tissues central to the animal lifestyle? |
Nervous and muscle |
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Which stage of life dominates animal life cycle? |
Diploid |
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Define zygote. |
A fertilized egg |
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What is cleavage? |
A series of rapid cell divisions of a zygote into a blastula of the same size; a succession of mitotic cell divisions without cell growth between the divisions. |
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What forms as a result of cleavage? Define it. |
A blastula; a hollow ball of cells; the multicellular stage of embryonic development. |
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What is the hollow inside of a blastula? |
The blastocoel coel- pronounced "seal" |
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What does coel ("seal") mean? |
Cavity |
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What is the developmental stage that follows the blastula? What happens? |
Gastrulation; invagination. |
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What does invagination mean? |
To turn in |
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What happens during gastrulation? |
The layers of embryonic tissues that will develop into adult body parts are produced. |
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What is the result of gastrulation? Define it. |
A gastrula- a two-layered embryo formed by the invagination of a blastula.
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What is an archenteron? |
The pouch formed in gastrulation. |
