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Essential Knowledge

Essential Knowledge. 4.c.1 – Variation in molecular units provides cells with a wider range of functions (21.5). Chapter 21 – Key Concepts. Embryonic development involves cell division, cell differentiation, and morphogenesis. Different cells of an organism have the same DNA.

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Essential Knowledge

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  1. Essential Knowledge • 4.c.1 – Variation in molecular units provides cells with a wider range of functions (21.5)

  2. Chapter 21 – Key Concepts • Embryonic development involves cell division, cell differentiation, and morphogenesis. • Different cells of an organism have the same DNA. • Different cells make different proteins, usually by transcriptional regulation.

  3. Chapter 21 – Key Concepts • Transcriptional regulation is directed by maternal molecules in the cytoplasm and signals from other cells. • Homeotic genes direct the identity of body parts. • Homeobox genes have been highly conserved in evolution.

  4. Points to Know: • How do cells become specialized in structure and function? • Name 5 organisms that have been used as model organisms for development? • How does transcriptional control regulate cell development? • How does an embryo know “which way is up?”

  5. Points to Know: • Why have homeotic genes been conserved over evolutionary time? • Give an example of mutations or studies with homeotic genes.

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