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9 Cards in this Set

  • Front
  • Back
binary fission
cell division in prokaryotes.
domains of chromatin that are not expressed
domains of chromatin that are expressed.
paticular array of chromosomes in individual possesses.
geneticists count these in defining the number of schromosomes in a species
diploid number
normal number of chromosomes in a cell. Twice the haploid
Cell cycle Five phases
G1-primary growth phase
S-phase which cell synthesizes a replica of the genome
G2-second growth phase whih preparation sare made for genomic seperation. Mitochondria and other organelles replicate, chromosomes condense and microtubules begin to assemble at a spindle.
G1, S, and G2 constitute interphase.
M- (mitosis) phase of cell cycle where microtubular apparatus assembles, binds to chromosomes and moves chromatids apart.
C-Cytokinesis-cytoplasm divides.
microtubulesorganization centers
Interphase-chromosomes are invisible under light microscopes because they are not condensed. DNA replicates
prophase-condensation reaches point at which chromosomes first becomes visible with the microscope. nuclear envelope breaks down. Microtubules, mitotic spindle begins to form and is complete at end of prophase. Kenetochores begin to mature and attach to spindle
metaphase-kenetochores attach chromosomes to mitotic spindle and align them along metaphase plate at equator of cell
anaphase-kenetochore microtubules shorten, seperating chromosomes to opposite poles. Polar microtubules elongate, preparing cell for cytokinesis
telophase-chromosomes reach poles of cell. kinetochores disappear
polar microtubles continue to elongate, preparing cell for cytokinesis. nuclear membrane re-forms. Nucleous reappears. chromosomes decondense.
cytokinesis-plant cells: cell plate forms dividing daughter cells. animal cells: cleavage furrow forms at equator of cell and pinches inward until cell divides in two.