Cell Division, Mitosis, Meiosis

Question 1

Late Interphase (3 Points)

Answer 1

1. Nucleus is well defined and bounded by the nuclear envelope
2. Duplicated chromosomes are mostly pinched chromatin fibers
3. Microtubules extend from the duplicated centrosomes

Question 2

Mitosis- Purpose:

Answer 2

. To replenish dead or dying cells, to allow an organism to grow and develop
.results in cells such as internal organs, skin, blood, etc.
.makes identical cells

Question 3

The 4 (5) Main Stages of Mitosis

Answer 3

1. Prophase (Prometaphase)
2. Metaphase
3. Anaphase
4. Telophase

Question 4

Prophase (_____)

Answer 4

1st stage of Mitosis
Mitosis Begins

.Nucleoli disappears
.Chromatin fibers become tightly coiled in the nucleus
.Condensing into discrete chromosomes
.Centrosomes move away from each other as mitotic spindles begins to form into the cytoplasm

Question 5

Prometaphase

Answer 5

.Nuclear envelope fragments
.Chromosomes condense further and form kindochores (structures at the centromere region that microtubules bind)
.Microtubules extend from each pole and invade the nuclear area and either attach to kindochores or microtubules from the opposite side.

Question 6

Metaphase

Answer 6

.Centrioles are at opposite sides
.Chromosomes line up at the center of the cell equidisant from each pole
.microtubles are attatched to the keinetochores of each sister chromatid facing pole

Question 7

Anaphase

Answer 7

.Paired centromeres of each chromosome separate, dividing the sister chromatids
.Centorsome (centriole) poles move further apart
.Microtubles begin to shorten, pulling their attatched chromatids towards opposite poles

Question 8

Telophase

Answer 8

.Begins when chromosomes have reached the two poles
.Daughter nuclei begin to form from the fragments of the parent cell
.Chromatin fibers loosen

Question 9

Cytokinesis

Answer 9

. a cleavage furrow forms between daughter cells and the cell is pinched in two, equally dividing the cytoplasm