BIOLOGY OF HIGHEK SEED PLANTS 37 



of the spindle fibers to the chromosomes ? What 

 relation does the spindle sustain to the sur- 

 rounding cytoplasm ? 



(4) Draw a metaphase stage. Outline the entire cell. 

 Draw in the spindle, the chromosomes, and the 

 cytoplasm in one half of the cell. Label accurately. 



c. Anaphase. 



(1) The chromosomes. Note the form and position of 



the chromosomes in anaphase. How have the 

 two sets of daughter chromosomes, seen in ana- 

 phase, been derived from the single set observed 

 in metaphase ? Have the daughter chromosomes 

 the same form as the mother chromosomes of 

 metaphase? Are they as large as the mother 

 chromosomes ? 



(2) Tlie first spindle. Are there spindle fibers between 



the two sets of daughter chromosomes ? If so, 

 do they have the same appearance as they have 

 in the polar portions of the spindle ? What is 

 meant by traction and supporting fibers of a 

 spindle ? Do you see any such distinction in 

 the fibers of the anaphase spindle ? 



(3) Draw the spindle and chromosomes in an anaphase 



stage. Label all parts accurately. Indicate the 

 position of traction and supporting fibers. 



d. Telophase. 



(1) Early telophase. Observe, if possible, an early 



telophase stage in which the chromosomes are 



aggregated at the poles, as described in the text. 



(d) Chromosomes. Have the chromosomes changed 



their form since the anaphase stage ? What 



relation do they sustain to each other ? Are 



they separated or joined ? 



51U7 



