Biology 1201A Lecture Notes - Prophase, Chromosome, Nuclear Membrane

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Genetic instructions are coded in the dna of cells. The entire mechanism of prokaryotic cell division is called binary fission and can be broken down into three periods. C period- chromosomes are replicated and move to separate ends of the cell. D period- membrane pinches together between them and two daughter cells form. Eukaryotic chromosomes contain a much greater length of dna than prokaryotic cells. After interphase the cell begins the process of mitosis which can be broken down into 4 stages: Mitotic spindles begin to form between two centrosomes as they start migrating towards opposite ends of the cell to form cell poles. (prometaphase- the nuclear envelope breaks down initiating prometaphase. Spindles are sent from the centrosomes at opposite ends of the cell, some spindle may attach to chromosomes. Metaphase- spindle microtubles move the chromosomes into alignment at the spindle midpoint, also called the metaphase plate.

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