BIO 201LLB Lecture 25: Bio 201 Lecture 25
1 Nov 2018
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Document Summary
2 long pieces of double stranded dna bunched up and held together at the centromere. One dna strand in the chromosome chromatid. 1st generation dna molecules are hybrids (dark) 2nd generation dna molecules hybrid or all brdu (dark or light) Dna unwinds and new dna gets put on. How can you tell it is replication and not transcription: a is paired with t, if it"s transcription, a is paired with u (rna) M-phase: mitosis: division of nuclear material, doubles the amount of dna, so that cell division/cytokinesis can occur, cytokinesis: cell division, mitosis doesn"t include cytokinesis. Single piece of double-stranded dna with associated proteins, mostly histones. Compact due to wrapping of dna around histones. These are two pieces of double-stranded dna. Cell cycle exceptions (some: no g1/g2: most or all of interphase for transcription and replication, much mitotic activity. Ex: embryonic cells, spermatogonia, etc: stuck in g1/g0: no division at all.
