How do we grow 5 1 The Cell

How do we grow?

5. 1 : The Cell Cycle:

Objectives �Recognize the stages of the cell cycle

Where it all began… You started as a cell smaller than a period at the end of a sentence…

Getting from there to here… �Going from egg to baby…. the original fertilized egg has to divide… and divide…

Why do cells divide? �Discuss with your group. �Give me three reasons cell divide.

Why do cells divide? �For reproduction �asexual reproduction �one-celled organisms �For growth �from fertilized egg to multi-celled organism �For repair & renewal �replace cells that die from normal wear & tear or from injury amoeba

So how would you split the cell life cycle? Doing it’s every day job Interphase Reproducing/Dividing Mitotic phase

Try to fill the cell cycle with the proper parts after seeing this video �http: //www. youtube. com/watch? v=Q 6 uc. KWIIFmg

What’s a chromosome?

DNA & Chromosomes The genetic information is held within the chromosomes. Chromosomes become visible through a light microscope as the cell goes through division (both mitosis and meiosis).

Chromosomes Every cell in the human body, apart from mature red blood cells, contains a set of chromosomes in its nucleus. chromosomes In all human body cells (except gametes) there are 46 chromosomes arranged in 23 pairs. centromere nucleus Cell about to divide Other species of animals and plants have different numbers of chromosomes in their cells.