Term
| How does a Zygote become an animal? |
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Definition
-Eggs contain cytoplasmic determinants (proteins and RNAs) that direct first stages of animal development
-Cell division -> Cell differentiation -> Morphogensis |
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Term
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Definition
| Fertilization -> Cleavage -> Rapid cell division creates hollow ball of cells (Blastula) |
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Term
| Cytoplasmic determinants are |
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Definition
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Term
| Polarity - defined by... and different poles |
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Definition
-Polarity defined by distribution of yolk (stored Nutrients)
-Vegetal Pole (more yolk)
-Animal Pole (Less yolk) |
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Term
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Definition
1. Dorsal - Ventral
2. Anterior - Posterior
3. Right - Left |
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Term
| Gastrula - Rearranges ___ into 3 layered embryo, resulting in formation of what three tissues... |
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Definition
-Rearranges Blastula
-Ectoderm - Outermost layer
-Mesoderm - Middle Layer
-Endoderm - Inner later |
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Term
| Definition of Organogenesis |
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Definition
| -Interaction of 3 germ layers results in formation of organs, results in individual with the body organization characteristic of its species |
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Term
| In early vertebrate organogenesis the notochord froms from _____ and the neural plate froms from ______ |
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Definition
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Term
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Definition
| Central Nervous system (Brain and spinal cord) |
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Term
| Neural crest cells develop ____ and form ___ |
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Definition
| Neural crest cells develop along the neural tube of vertebrates and form various parts of the embryo (Nerves, parts of teeth, skull bones, etc) |
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Term
| Cells in a multicellular organism share the same.. |
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Definition
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Term
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Definition
| -The expression of different genes |
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Term
| Two general principles underlying differentiation: |
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Definition
1. During early cleavage divisions, embryonic cells must become different from one another
2. After cell asymmetries (resulting from uneven distribution of cytoplasmic determinant) are set up, interactions among embryonic cells influence their fate, usually causing changes in gene expression (INDUCTION) |
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Term
| Two general principles underlying differentiation: |
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Definition
1. During early cleavage divisions, embryonic cells must become different from one another
2. After cell asymmetries (resulting from uneven distribution of cytoplasmic determinant) are set up, interactions among embryonic cells influence their fate, usually causing changes in gene expression (INDUCTION) |
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Term
| Simple summary of embryonic development |
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Definition
| -Fertilization proceeds through cleavage (Blastula), gastrulation (Gastrula - 3 germ layers, endo-meso-ectoderm) and organogenesis (Notochord, coelem, neural tube) |
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