What happens in Whitefish interphase?
Early in interphase the cell (A) reaches its full size and then starts preparing for its next division. Preparation includes chromosome replication, replication of cellular organelles, including centrioles, and the synthesis of microtublule units. Distinct chromosomes are not visible to the microscope at this time.
Why do whitefish embryos demonstrate mitosis?
The whitefish embryo is a good place to look at mitosis because these cells are rapidly dividing as the fish embryo is growing. The onion root is also a good place because this is the area where the plant is growing. Remember that when cells divide, each new cell needs an exact copy of the DNA in the parent cell.
What happens in Whitefish metaphase?
Metaphase Whitefish Blastula Cell. This cell is in very late stage of metaphase. The chromosomes are attached to the microtubules of the spindle and they are lined up across the equator of the cell in a circle that is perpendicular to cell’s long axis.
Which phase of mitosis is shown in the Whitefish cell?
Prophase
Prophase Whitefish Blastula Cell. The arrows (A) in the photo point to a cell in the prophase stage of mitosis. During this stage the chromosomes become visible, the nucleoli disappear, the nuclear membrane is broken down and the spindle begins to take form.
What happens in Whitefish telophase?
In telophase (G), the chromosomes have migrated to opposite poles, the cytoplasm starts to be divided at the equator by formation of the cell membrane. Eventually, the daughter nuclei will be reconstructed, the chromatin will lose its condensation, and separation of the daughter cells will occur.
What happens in Whitefish anaphase?
Their separation is caused by the removal of microtubular units at the polar ends of the fibers (A) to which the chromosomes are attached. This process shortens the fibers and draws the chromosomes ever closer to the pole. In the diagram the separating sets of chromosomes are reaching the opposite poles of the cell.
What happens to the Whitefish during cytokinesis?
During cytokinesis microfilaments bring about the complete constriction of the cell and the division of the cytoplasmic contents into two halves.
Why is the whitefish used to study mitosis?
Why is the whitefish used to study mitosis quizlet?
Why does mitosis occur in the Whitefish embryo?
The whitefish embryo is a good place to look at mitosis because these cells are rapidly dividing as the fish embryo is growing. This is why mitosis is only visible in cells that are dividing, like the whitefish embryo and the onion root tip. Mitosis can take several hours to complete. Click to see full answer
What are the five stages of mitosis?
The chromosomes continue to condense so they are fully visible and compact
Why is the blastula used in mitosis?
Introduction: To study mitosis,biologists often look at particular cells.