lecture 2 Life Cycles

lecture 2 Life Cycles - Life Cycles A Central Theme In...

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1 Life Cycles A Central Theme In Embryonic Development
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2 1. 2. 3. 4. 5. 6. Amphibian life cycle 7.
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3 Separation of Germ cells and Somatic Cells
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4 Stage of egg maturation at the time of sperm entry in Amphibians Progesterone allows the egg to complete its second meiotic division providing a haploid pronucleus
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5 Accumulation of Yolk in the vegetal hemisphere
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6 1. Fertilization
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7 Fertilization accomplishes two separate activities The combining of genes derived from two parents The creation of a new organism
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8 The combining of genes derived from two parents
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9 The creation of a new organism (B) Cytoplasmic movement and activation of molecules necessary to begin cell cleavage and development (A) The egg pronucleus and the sperm pronucleus will meet in the cytoplasm to form the diploid zygote
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10 Cortical Rotation The sperm determines the plan of cell division and the location of the Dorsal Axis
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11 Pigmented animal region Gray crescent Vegetal region The gray crescent indicates the location of the future dorsal Lip
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This note was uploaded on 11/26/2011 for the course BIO 361 taught by Professor Dr.bjgrubb during the Fall '10 term at N.C. A&T.

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lecture 2 Life Cycles - Life Cycles A Central Theme In...

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