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Unformatted text preview: Cell division : is at the heart of reprod. 2 types reprod- sexual (similar) and A sexual (same makeup). Fct of Asexual reprod : replacement of lost cells, repair of damaged cells. Features: mitosis, no genetic variation, fast, in gen larger numbers of offspring, no need for gametes(sex cells). Prokaryotes reprod by binary fission. Eukaryotes more complex, more genes, genes in nucleus, grouped in chromosomes. Chromosomes- DNA containing structures that carry the organisms genes. Made up of chromatin- combination of uncoiled DNA and protein molec. DNA packing- successive levels of coiling of DNA & proteins results in highly condensed chromosomes. Mitosis- Chromosomes duplicates producing sister chromatids. Sister chromatids contain identical genes. The chromatids are joined together tightly at the centromere . Cell cycle-consists of 2 phases, interphase and mitotic phase. S-DNA synthase. Interphase- cells spends most time here(most common to see), cell performs normal fct., cell doubles everything in cytoplasm, chromosome duplication. Sequence: G1 cell grows in here(most common to see), cell performs normal fct....
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This note was uploaded on 04/09/2008 for the course BIOLOGY BIOL 107 taught by Professor Griffith-jackson,s during the Summer '07 term at Mesa CC.
- Summer '07