Biology 1001A Lecture Notes - Lecture 4: Sister Chromatids, Intermediate Filament, Nuclear Membrane

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Chloroplasts: nuclear genome = dna in nucleus, mitochondrion genome = dna in mitochondria, chloroplast genome = dna in chloroplasts. N. g: shape of nuclear vs. organelle chromosomes in eukaryotic cells, mitochondrion genome has circular chromosomes, chloroplast genome also has circular chromosomes. Flaw in the cell cycle: skin cells have a certain life span that are programmed to die allow newer cells to generate, some cells only function as dead cells, they function as a skeleton (ex. Xylem -> transport tissue in plants: main features of each stage of mitosis with respect to cytoskeleton and chromatin. Chromatin begins to condense into chromosomes with 2 sister chromatids. Duplicated centrosomes (centriole + microtubules) begin to form microtubules from the centrioles as they move to opposite poles of the cell. These microtubules begin to penetrate the diminishing nuclear membrane: prometaphase. Chromatin continues to condense further, starting to form the x chromosome shape.

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