biochap12

biochap12 - CHAPTER 12 READING chromosome- packages of DNA...

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CHAPTER 12 READING chromosome- packages of DNA -made of chromatins - complex of DNA and associated protein somatic cells - all body cells except for reproductive cells gametes - sperm and eggs DISTRIBUTION OF CHROMOSOMES DURING CELL DIVISION -When cell is not dividing, each chromosome is in the form of a long thin chromatin fiber -after duplication, the chromosomes condense sister chromatids - Each duplicated chromosome has two sister chromatids -contain identical DNA molecule -connected at centromere mitosis- division of the nucleus cytokinesis - the division of the cytoplasm INTERPHASE interphase -During interphase the cell grows and copies it chromosome in preparation for cell division -Cell spends 90% of its time in this cycle G1 -”first gap” S Phase - “synthesis” G2 Phase -”second gap” During all three subphases the cell grows by producing proteins and cytophasmic organelles ****Chromosomes are duplicated only during the S phase ****G2, Mitotic M Phase, G1, S, G2, etc MITOTIC SPINDLE
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This note was uploaded on 07/14/2009 for the course BILD BILD1 taught by Professor Bever during the Spring '08 term at UCSD.

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biochap12 - CHAPTER 12 READING chromosome- packages of DNA...

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