RECOMBINATION IN SEXUAL ORGANISMS 



69 



Fusion of haploid 

 nuclei, one from 

 each parent 



Diploid zygote nucleus 

 with chromosomes 

 duplicated and paired 

 in early prophase 



Late prophase, 

 chromosomes 

 somewhat condensed 

 through coiling 



Metaphase of first 

 meiotic division, 

 chromosomes at 

 center of spindle 



Anaphase, parental 

 chromosomes 

 segregate by moving 

 towards poles 



Telophase, new 

 nuclei are formed 

 at either end of 

 spindle remnant 



Metaphase of second 

 meiotic division, centromeres 

 divide after short 

 interphase 



Anaphase of second 

 meiotic division 

 separates sister 

 chromatids 



Four haploid nuclei 

 are produced 

 after telophase 



Ratio- 1 al^Aar 



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