CHAPTER 22 – CELL REPRODUCTION

 

MITOSIS – A type of cell reproduction in which 2 identical cells are made from 1 cell.

 

 

 

 

 

2 Stages of Mitosis:

 

 

 

 

 

 

All __________ cells are formed and regenerated by ________________. This process occurs throughout life.

  

Life Spans of different human body cells:

Brain cells - _______________              Muscle cells - _______________

Red Blood Cells - ___________                Platelets - __________________

Stomach Lining Cells - _____________      Liver Cells - _________________

Intestine Lining Cells - _____________      Skin Cells - _________________

 

 

Mitosis works similar to how a photocopy machine works:

 

Start with a picture

 

End with 2 of the exact same copy of the original

 

 

What happens BEFORE Mitosis occurs?

 

Chromosome number ____________________ (Example 4->8)

 

 

 

 

 

 

Steps of Mitosis

 Step One

 

 

 

 

 

 

 

 

Step Two

 

 

 

 

 

 

 

 

 

Step Three

 

 

 

 

 

 

 

 

 

Step Four

 

 

  

 

 

 

 

 

 

Benefits of Mitosis

 

 

Differences between Plant Cell Mitosis & Animal Cell Mitosis

 

Plant Cell Mitosis Animal Cell Mitosis
   
   
   

 

MEIOSIS – A kind of cell reproduction that forms sperm and eggs (sex cells).

 

_________________________ - reproductive cells produced in sex organs.

 

Includes:

 

 

Meiosis involves __________________________ resulting in _______________________.

 

___________________ - A cell containing half the number of chromosomes as a body cell.

 

Example:

 

 

 

 

 

Refer to fig. 22-7 on page 471:

 

 

 

 

 

 

 

 

 

Steps of Meiosis

Step One

 

 

 

 

 

 

 

 

 

 

Step Two

 

 

 

 

 

 

 

 

 

 

 

 

Step Three

 

 

 

 

 

 

 

 

 

 

 

 

 

Step Four

 

 

 

 

 

 

 

 

 

 

 

 

 

Step Five

 

 

 

 

 

 

 

 

 

 

 

 

Step Six

 

 

 

 

 

 

 

 

 

 

Sperm, Eggs & Fertilization

Sperm & Egg Similarities Sperm Eggs
     
     
     
     
     

 

Refer to figure 22-10:

  

 

 

 

 

 

 

 

When sperm (haploid) fertilizes an egg (haploid), the chromosome number becomes ________________. 

 

Changes in the Rate of Mitosis are caused by:

 

________________________ - Rate of cell division, or mitosis, slows down in body cells.

  

________________________ - A disease in which body cells reproduce at an abnormally fast rate.

 Causes of Cancer 

 

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