3 lecture ZOO NEW

3 lecture ZOO NEW - creation of new individuals...

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Generalized life cycle (adapted to amphibians) Fig. 2.1 Although, this is for amphibians, it fits perfect for mammals.
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Premises for basic questions in developmental biology Role of the nucleus in controlling morphogenesis Sexual reproduction Meiosis, cooperation between individual cells, resorting of genes Temporal and spatial regulation Genetic constancy
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Evidence for control by the nucleus Enucleated fragments of single celled protists die Nuclear transplants in Acetabularia regenerate different morphology caps (Hammerling, 1934) (read the notes section)
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Regeneration - Acetabularia Fig. 2.5
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Transplant nucleus - Acetabularia
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Sex and Reproduction Sex – combining genes from two different individuals into new arrangements. can occur without reproduction in bacteria and paramecia. Reproduction
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Unformatted text preview: creation of new individuals Characteristic of organisms undergoing fission (bacteria and protists) Sexual reproduction occurs only in eukaryotic organisms (re:Chlamydomonas) (ex: Chlamydomonas algae with chlorophyll, Sexual Reproduction Meiosis Differentiation and Morphogenesis What determines cell fate in a complex organism? Exemplified by life cycle of dictyostelium (A slime mold) Dictyostelium life cycle Fig. 2.16 Regulation in Slime mold Anterior cells form stalk, posterior cells become spores Excise the anterior portion prior to culmination, Next most anterior cells become stalk (were destined to be spores) Regulation the ability of cells to change their developmental fate according to the location with the whole organism...
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3 lecture ZOO NEW - creation of new individuals...

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