1. Station 2: Specialized Cells

2. Fertilization During Fertilization the gametes unite to form the:
zygote or fertilized egg 23 + 23 46

3. The Zygote 46
Contains the full amount of chromosomes, which is 46
The zygote then divides by mitosis to form a multi-cellular organism
The specific name given to this type of cell division of the early embryo is called cleavage
Cleavage

4. Cleavage
Zygote begins to divide quickly in the fallopian tube in a process called cleavage
This process leads to the formation of the blastocyst. This structure can be described as a “ball of cells”.

5. Early Development
Once the embryo has implanted itself in the lining of the uterus, the cell then undergoes a process known as differentiation
The inner cells of the fertilized egg form into “specialized cells”.

6. - The inner cells of the fertilized egg develop into different cells that then develop into more complex tissues. - These tissues are specialized, meaning they have specific roles in the body depending on the body system they are apart of. - Hence the terms “differentiation” and “specialized” cells.

7. Embryo All human organ systems are developed by the:
The first three months of pregnancy

8. Embryonic growth
Growth of the embryo occurs for the next six months of the pregnancy