2007-11-30 01:39:04 · 11 answers · asked by Anonymous in Science & Mathematics ➔ Biology
new cells are produced from pre existing cells.
the process that makes new cells is called mitosis
mitosis has 4 phases
prophase
metaphase
anaphase
telophase
prophase - the DNA condenses into chromosomes as the nuclear envelope of the nucelus dissassembles. once the DNA is condensed, the chromosomes pair up into homologous pairs, where the same chromosomes pair up. the DNA replicates before prophase so there should be homologous chromosomes. the centrosomes, microtuble organizing center, also form.
** this is the longest phase in mitosis because condensing the DNA is a long and complicated procedure
metaphase - in short, the homologous chromosomes move to the metaphase plate, the center of the cell.
the centrosomes send out microtubules, some of which attach to the kinetochore, the place on the centromere, the place where the homologous chromosomes are attached, where microtubules attach. these micortubules are called kinetochore microtubules. these move the homologous chromosomes onto the metaphase plate. some microtubules continue to grow not attaching to the kinetochore, these are called nonkinetochore microtubules.
anaphase - in short, the sister chromatids of the homologous chromosomes separate
the kinetochore microtubules pull the chromosomes at both ends, separating the sister chromatids. the nonkinetochore microtubules kept growing and still are growing, stretching the cell by pushing against the membrane of the opposite sides
telophase - the sister chromatids reach the ends of the cell and cytokinesis begins
**cytokinesis is a separate process from mitosis and is different in plant cells and animal cells
2007-11-30 11:07:42 · answer #1 · answered by gee im a tree 3 · 2⤊ 1⤋
New Cells Are Produced From
2017-01-09 18:53:23 · answer #2 · answered by ? 4 · 0⤊ 0⤋
new cell can only be produced from the pre-existed cell,
the body cell undergo a process called mitosis division while the reproductive cell or your germ cell undergo a process called meiosis division in order to generate new cell
2007-11-30 02:17:15 · answer #3 · answered by >D_ConTradictor< 4 · 0⤊ 0⤋
New cells are produced from stem cells. Stem cells are cells which are multipotent or totipotent, which means that they are able to be differentiated into some specific kinds of cells. Also, somatic cells are able to divide.
: )
2007-11-30 01:44:59 · answer #4 · answered by Shan 2 · 2⤊ 0⤋
Old cells going through mitosis.
2007-11-30 01:43:10 · answer #5 · answered by Lady Geologist 7 · 1⤊ 0⤋
The cell absorbs additional material, grows, then divides in two.
Simple no?
2007-11-30 01:42:12 · answer #6 · answered by jcurrieii 7 · 0⤊ 0⤋
cell
2007-11-30 01:47:43 · answer #7 · answered by pokemon maniac 6 · 0⤊ 0⤋
pre-existing cells.
2007-11-30 04:31:07 · answer #8 · answered by Anonymous · 0⤊ 0⤋
division
2007-11-30 01:43:08 · answer #9 · answered by Amrish S 2 · 1⤊ 0⤋
recycled materials
2007-11-30 01:40:55 · answer #10 · answered by bavery42289 3 · 0⤊ 0⤋