Slide Set II Fall 11

Slide Set II Fall 11 - PROBLEM: Given the generality of the...

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Unformatted text preview: PROBLEM: Given the generality of the Central Dogma (replication, transcription & translation), how can a single cell give rise to the diversity of cell types in a multicellular organism? Solution: cell signaling & gene regulation (last time) Next: some final loose ends & then: DEVELOPMENT I. The Genetic Basis of Development A. Cellular processes guiding development 1. cell division 2. cell differentiation 3. morphogenesis B. How cells differentiate 1. genomic equivalence 2. evidence for genomic equivalence a. totipotency and cloning i. in plants ii. in animals b. stem cells i. embryonic ii. adult 3. molecular processes a. determination i. via cytoplasmic determinants (CDs) ii. via induction by cell signaling loose ends Fig. 1-9 Nuclei containing DNA Sperm cell Egg cell Fertilized egg with DNA from both parents Embryos cells with copies of inherited DNA Offspring with traits inherited from both parents ? ? ? What processes, besides cell signaling, cell communication, & gene regulation control the steps in development? Proper embryonic development requires that the correct Genes are expressed at the correct time and in the correct location . Fig. 18.18; 7th: 21.13 A. Cellular processes guiding embryonic development For a single, fertilized egg cell (= ZYGOTE ) to develop into a multicellular embryo (later, adult) requires: zygote multicellular embryo...
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Slide Set II Fall 11 - PROBLEM: Given the generality of the...

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