Seventh grade science questions?

what is a purebred trait? what is a hybrid trait? If
 short 
fur
 (H) 
is
 dominant 
over 
long 
fur 
(h),
what
 is 
a
 possible 
genotype 
of 
a mouse 
with 
short 
fur?
 what is a phenotype of a mouse with the genotype Hh?