Cell Division

cell division

the way a cell reproduces

What must cells do between divisions to make sure that they don't just get smaller and smaller?

a cell must grow.

DNA

substance where the genetic information of a cell is carried.

What do cells need to do between divisions to make sure that a full set of DNA gets passed on to each daughter cell?

The DNA must be copied so there is a full set of DNA to pass on to each daughter cell.

Cells that are in the process of dividing are said to be in

Mitosis or Cytokinesis

A cell spends most of its life cycle in what phase?

Interphase

Interphase

The cell grows, DNA is copied and new organelles form

Prophase

Chromosomes are formed from chomatin, and the nuclear membrane dissolves. Spindle fibers form between the centrioles.

Metaphase

The centromere in each chromosome attaches to a spindle fiber and the chromosomes form a line along the middle of the cell,.

Anaphase

The chromosomes split apart and the two sets of sister chromatids (daughter chromosomes) move to opposite ends of the cell.

Telophase

New nuclear membranes form around the two sets of dauther chromosomes, which unwind into cromatin.

Cytokinesis

The sides of the cell pinch inward, dividing the cytoplasm and forming two daughter cells.

What are the four phases of mitosis?

prophase, metaphase, anaphase and telophase

During which phase is DNA duplicated?

Interphase

What is the relationship between chromatin and chormosomes?

During prophase chromatin condenses to form chromosomes.

In which phase are chormatids pulled apart?

Anaphase

What is the role of the centrioles?

Centrioles produce spindle fibers and help to organixe the movement of chromosomes.

In which phase does a new nuclear membrane develop?

Telophase

A cell has a single line of chromosomes. What is the phase?

Metaphase

During which three phases are individual chromosomes no longer visable?

Telophase, cytokinesis, and interphase

Why is it important that the cells DNA is duplicated before cell division?

If the cell's DNA weren't duplicated, then each daughter cell would only get half of a complete set of DNA.

Which phase of the cell cycle is longest?

Interphase