Mitosis Flashcards
period of a cell’s life when it carries out its normal metabolic activities and grows; chromatin, nuclear envelope, and 1 or more nucleoli are intact and visible[G1,S,G2]
interphase
chromatin condenses, forming barlike chromosomes into sister chromatids held together by centromere, nucleoli disappear, and 2 centrosomes separate, the centrosomes act as focal points for growth of mitotic spindle which propel the centrosomes toward opposite ends[asters are seen from the matrix around centrosomes]
early prophase
while centrosomes still move apart, nuclear envelope fragments allowing spindle to interact with the chromosomes, some attach to kinetochores, which pull on each chromo to the equator of the cell
late prophase
second phase of mitosis where 2 centrosomes are at opposite poles, chromosomes cluster at middle with centromeres aligned at equator of spindle
metaphase
third and shortest phase of mitosis, each chromatid now becomes a chromosome. the kinetochore microtubules pull each choromo toward the pole it faces while the remaining spindle slide past each other, lengthenm,and push the 2 poles of the cell apart
anaphase
begins as soon as chromosomal movement stops, like prophase in reverse. the identical sets of chromosomes at the oppo poles of the cell uncoil and resume their threadlike chromatin form. new nuclear envelope forms around each chromatin mass, nucleli reappear and the spindle breaks down and disappears
telophase
as mitosis draws to a close, _____completes the division of teh cell into 2 identical daughter cells, occuring as a contractile ring of actin microfilaments forming the cleavage furrow . beginning during late anaphase and continues thru and beyond telephase
cytokinesis
interphase
early prophase
late prophase
metaphase
anaphase
telophase
