What trait only appears when a organism is a homzygous

Both can show.

Explanation:

The genotype can look like the following:

TT <= Homzygous Dominant

tt <= Homzyogous Recessive

Tt <= Heterzygous

See? It would be hard to determine exactly which trait would show without the second half of the name! (By the way, I can't say the proper names so I apologize)

I hope this helps! ^-^

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !