Chromosome Count


 

Can someone please give me a simple explanation on hybridizing, using the chromosome count.
 
For example, I was just checking I. versicolor on SIGNA, where it mentions the chromosome count is 2n=108.  It easily crosses with the laevigatae series, which has a chromosome count of 2n=32, while I. virginica has 2n=70 or 2n=72, as does I. virginica var shrevei.
 
Thank you!
 
El



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