How do grizzly bears grow from a single cell?

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Presentation transcript:

How do grizzly bears grow from a single cell? Adult Grizzly Zygote: fertilized egg Newborn Grizzly

Cell Differentiation

Functions of Cell Division 1) Replacement of lost or damaged cells

Functions of Cell Division 2) Growth-multicellular organisms develop from a single cell

Functions of Cell Division 3) Asexual reproduction

Connections between Cell Division and Reproduction Asexual reproduction individual parent divides into two genetically identical daughter cells Sexual reproduction two parents contribute genetic material to the offspring which is genetically unique

Prokaryotes Genes usually carried on a single circular DNA molecule DNA has a few proteins and is attached to the plasma membrane at one point DNA not bounded by membrane (nucleoid region) Cells divide by binary fission http://www.karlloren.com/biopsy/images/TEM-Fission_rod.jpg

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