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Traits:
    Is horn length a heterozygous or homosygous trait?
If the horn length is Heterozygous, then there will defferences in horn lengths between different beetles. If it is Homosygous, all horn lengths would have to be the same.
S = Short
l = Long                                      
  Sl
 S SSSl 
lSl ll
S = Short
l = Long
 SS
l SlSl 
lSl Sl 

s = Short

L = Long

 sL
s ss sL
L sLLL 

s = Short

L = Long

 ss
LsL sL 
LsL sL 

 

The results definitively show that Horn length is a Heterozygous trait. If it was homozygous, there would be eith no beetles with short horns, or no beetle with long horns.