Question

Match each event to the phase in which it occurs.

-       A.       B.       C.       D.       E.       F.       G.       H.    Gap 1       -       A.       B.       C.       D.       E.       F.       G.       H.    Synthesis       -       A.       B.       C.       D.       E.       F.       G.       H.    Gap 2       -       A.       B.       C.       D.       E.       F.       G.       H.    Prophase       -       A.       B.       C.       D.       E.       F.       G.       H.    Prometaphase       -       A.       B.       C.       D.       E.       F.       G.       H.    Metaphase       -       A.       B.       C.       D.       E.       F.       G.       H.    Anaphase       -       A.       B.       C.       D.       E.       F.       G.       H.    Telophase

A. Sister chromatids attach at the centromere B. The cell grows C. Nuclear membrane fully dissociates D. Chromosomes replicate E. Chromosomes align in the center of the cell F. Sister chromatids separate G. Chromosomes decondense H. The cell prepares for mitosis

Answer 1

The following events occur in the following phases :

Gap 1 ------------------ B. Cell grows

Synthesis -------------- D. chromosome replicate

Gap 2 ------------------- H.Cell prepare for mitosis

Prophase------------ C.nuclear membrane fully dissociate

Prometaphase -------- A. sister chromatic attach to centromere

Metaphase ------------ E. chromosomes align in centre of cell

Anaphase ------------- F. sister chromatic separate

Telophase -------------- G. chromosome decondenses

Explanation --

In an eukaryotic cell, cell cycle is divided into four various stages which help growth of organism. These phases are divided into G1 (gap1) , S phase (synthesis phase) , G2 (gap 2) and the M phase (mitotic phase). G1, G2 and S phase are collectively known as Interphase. Interphase occurs between two Mitotic phase (M phase).

In the G1 phase, the cell grows itself in size Or copy it's organelle.

In S phase, it duplicates the DNA and it's content.The DNA becomes double of original ie. If it was 2C it becomes 4C

In G2 phase, the proteins are synthesized making preparations for the cell to undergo into mitosis/division.

Then starts the M phase, where stages of mitosis occurs in following order : prophase, prometaphase, metaphase, anaphase and telophase

Prophase - chromosome start degenerate and nuclear membranes degenerate completely at the end of prophase. Mitotic spindle formation occurs

Prometaphase - nuclear envelop breaks relaxing chromosome and this Realesed chromosome are catched by the mitotic spindle. Microtubules can bind to chromosomes at the kinetochore, a patch of protein found on the centromere of each sister chromatid. Centromeres are the regions of DNA where the sister chromatids are most tightly connected.

Metaphase - All captured chromosome align themselves at the centre of the spindle known as metaphasic plate.

Anaphase - sister chromatids are separated and pulled apart from each other moving toward opposite pole of cell.

Telophase - cell is done dividing and now it start restoring it's components. Two new nuclei form, one for each set of chromosomes. Nuclear membranes and nucleoli reappear.The chromosomes begin to decondense and return to their “stringy” form.

After the telophase is done, the cell cytoplasm divide which is known as cytokinesis forming two new cells.