MBG 1000 Lecture Notes - Lecture 20: Nuclear Membrane, Telophase, Dna Polymerase
Document Summary
Each chromosome consists of 1 chromatid before s phase. One molecule of dna wrapped around a protein scaffold = 1 chromatid. Every human somatic cell has 2 copies of chromosome 1, 2, 3, 4, xx or xy, etc. Each chromosome consists of 2 genetically identical sister chromatids after s phase. After s phase, a somatic cell has 2 copies of chromosome 1, 2, 3, 4, xx or xy, etc. , and every chromosome consists of 2 identical sister chromatids. Dna accurately copied in s phase, and the dna is portioned in mitosis to create 2 genetically identical cells. In addition to genes, chromosomes contain specific dna sequences that has specific functions. Repetitive dna sequence located within the chromosome. Binds to mitotic spindle via kinetochore proteins. *as cells get older, telomere function tends to go, and a variety of diseases can come in. At the ends of the chromosome; repetitive dna sequences; heterochromatic (very tightly compressed)