Download mitosis veg prop - Hicksville Public Schools

STAGES OF MITOSIS:
The body cells of all organisms have a special way of dividing. The dividing of a
cell to form two new cells that are exactly alike is called mitosis. The dividing cell
is called the parent cell, & the 2 new cells are called the daughter cells. Before
the parent cell divides it makes a copy of its nucleus so that each daughter cell
will have one. Thus, the division of a cell begins in its nucleus. Refer to the figures
to the right as you read about the five phases of mitosis:
1. INTERPHASE- means between phases. It is the time
between cell divisions. No division takes place, but the
cell is very active. The cell is carrying out life functions.
DNA makes a copy of itself. The centrioles-two small
structures just outside the nucleus-are copied.
INTERPHASE
2. PROPHASE- is the time before the doubled DNA gets
into position. The doubled DNA shortens & thickens into
threadlike structures. During prophase, the centrioles
pairs move to opposite sides of the nucleus. The centrioles
make long fibers which form an oval shaped structure called
a spindle between the 2 centriole pairs. At the same time
the nuclear membrane disappears.
PROPHASE
3. METAPHASE- is the time when the doubled DNA
threads line up in the middle of the spindle. Each centriole
pair looks like it is playing tug-of-war with the short threads.
METAPHASE
4. ANAPHASE- is the time when doubled DNA threads
separate into 2 groups & move to opposite ends of the spindle.
The DNA threads are now called chromosomes.
5. TELOPHASE- is the last phase of mitosis. A nuclear
membrane forms around each group of chromosomes. Now
that the nucleus is copied, the parent cell divides into 2
identical daughter cells. Cell division occurs when the cell
membrane pinches together in the middle. Each new cell has
a complete set of chromosomes in its nucleus with 2 centrioles
outside the nucleus.
ANAPHASE
TELOPHASE
DAUGHTER CELLS
VEGETATIVE PROPAGATION REVIEW
I. TRUE OR FALSE:
T
1. Plants reproduce asexually from runners & rhizomes.
F
2. A potato is a bulb.
T
3. Rhizomes grow under the ground.
F
4. A tuber is a short underground flower.
F
5. All stems grow upward.
F
6. Stiff plants reproduce by layering.
T
7. Cuttings & grafting are artificial means of reproducing plants.
T
8. A cutting may be a stem or a leaf.
F
9. A stem or leaf cutting should be kept dry.
F
10. All kinds of plants can be grafted together.
II. MATCHING:
COLUMN A
COLUMN B
C
1. vegetative propagation
a) a bud
E
2. tuber
b) short underground stem with colorless leaves
A
3. tuber eye
c) asexual plant reproduction
B
4. bulb
d) store food
5. tubers & colorless
leaves of bulbs
e) heavy underground stem
D