Answer to preceding question. 

Early        Late 
 
 
Prophase - Examine the figures above and write  in your notes the activities listed below which occur   during prophase of mitosis. In these figures there are three homologous pairs of chromosomes (total of six chromosomes).  The short red and blue make up one pair, the medium red and blue make up the second pair and the long red and blue make up the third pair. Locate these in the figure to the left. 

1. Nuclear membrane pulls apart and becomes part of the E.R. and the nucleoli dissolves 
   (disappears). Note in later figure. 

2. Each long DNA molecule in the form of chromatin twists and coils back on itself to form rod shaped 
    chromosomes. 

3. Centrioles separate and a new centriole develops at the base of each parent centriole forming two 
    centriole organizing centers. These centriole organizing centers than migrate to poles on opposite 
    sides of the nucleus. 

4. Spindle apparatus forms from microtubules. Spindles will form between centromeres of each 
   chromosome and each centrilole organizing center. Also spindles will form between both centriole 
   organizing centers. The  spindles which  radiate out behind the centrioles are called asters. 
 
Study the figures showing prophase indicated by G-5 readings. 

WRITE THESE IN YOU NOTES. 

You must answer the question below correctly to move to the next page. 

How many chromosomes are in the prophase figures above? 

a ) 3                               c ) 12 
b ) 6                               d ) 24 
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