Which is not a trait shared by freshwater green algae and plants?

Stems, leaves, or roots.

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.