Lecture 17 – Fission, the Cell Cycle

Lecture 17 – Fission, the Cell Cycle -...

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Lecture 17 – Fission, the Cell Cycle A. Function - Idea is, from one cell you get 2 that are identical (daughter cells) 1. Unicellular organisms – increase numbers - Do it to increase numbers Form of asexual reproduction From 1 cell 2 cells 4 cells How prokaryotes reproduce 2. Multicellular organisms – growth, replace cells - For growth We start out as a zygote (a single cell) - For replacing cells Skin is sloughed off For repair B. Fission – bacterial reproduction - Fission means “to split” Prokaryotes actually split in half, only have a single chromosome (we have 46) No proteins are associated with this chromosome No cytoskeleton No organelles (anything membrane-bound) They double their chromosome and separate into two cells C. Eukaryotes (fig. 10-5) - Have 46 chromosomes - Proteins are associated with these chromosomes - Have a cytoskeleton - Have organelles (membrane-bound) More complex process 1. Interphase (chromatin, nucleus, nucleolus)
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Lecture 17 – Fission, the Cell Cycle -...

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