What makes you different from a mouse, dog or a monkey? The amount of genetic material (number of chromosomes) in each of your cells. 40 chromosomes 75 chromosomes 48 chromosomes with a piece missing from chromosome 2

Where are chromosomes are located in the cell? How many chromosomes do human cells have (except sex cells)? Each chromosome is composed of a genetic chemical called DNA or nucleus 46 deoxyribonucleic acid.

DNA is the blue print that makes you who you are. DNA stores all the information needed to make all parts of you.

The DNA molecule appears as a twisted ladder called a DOUBLE HELIX. FYI: If the DNA from a cell in your body was stretched out it would be greater than your height!

Untwist the double helix and it looks like a ladder The backbone of the DNA is made up of sugar and phosphate.

The steps of the ladder are made up of a series of chemicals called nitrogen bases. These bases are used like letters of form simple codes. The DNA alphabet (4 letters) Nitrogen bases: Adeninie A Cytosine C Thymine T Guanine G

A-A-C-T-G-A-T-A-G-G-T-C-T-A-G Complimentary strand T-T-G-A-C-T-A-T-C-C-A-G-A-T-C Segment of DNA

A segment of DNA that codes for a trait or characteristic is called a gene. The human genetic code is made up of about genes.

DNA Replication (during interphase ) 1. DNA helix unzips and each side serves as a template 2. Complimentary strands form 3. Two identical helices are formed