The Cell Cycle We have learned that gamete cells are specialized cells used in sexual reproduction. All other cells in the body are referred to as cells somatic (which will be the focus in this course). The three phases of a somatic cell’s life are: INTERPHASE cell is actively – involved in making proteins and preparing for division. A cell spends 90% of its life in this stage. MITOSIS division of the – nucleus. CYTOKINESIS division of the – cytoplasm. INTERPHASE cell is growing proteins and organelles are doubled DNA is doubled and exists as chromatin which is thin, long and stringy Prophase the doubled chromatin threads shorten and thicken to become visible (sister chromatids chromosomes attached at a centromere) the nuclear structures and nuclear membrane disintegrate MITOSIS between the two centrosomes, the mitotic spindle forms (fibres)
The Cell Cycle We have learned that gamete cells are specialized cells used in sexual reproduction. All other cells in the body are referred to as somatic cells (which will be the focus in this course). The three phases of a somatic cell’s life are: INTERPHASE – cell is actively involved in making proteins and preparing for division. A cell spends 90% of its life in this stage. MITOSIS – division of the nucleus. CYTOKINESIS – division of the cytoplasm. INTERPHASE cell is growing proteins and organelles are doubled DNA is doubled and exists as chromatin which is thin, long and stringy MITOSIS Prophase the doubled chromatin threads shorten and thicken to become visible chromosomes (sister chromatids attached at a centromere) the nuclear structures and nuclear membrane disintegrate between the two centrosomes, the mitotic spindle forms (fibres)
2.5_the_cell_cycle.docx