Question

a trait that can possibly mask another trait is known as a dominate ⇒ dominant x trait.
complete
a trait that is masked is known as a trait.
retry

Explanation:

In genetics (a subfield of Biology, which is under Natural Science), a trait that is masked by a dominant trait is called a recessive trait. This is based on Mendelian genetics where dominant alleles (and their corresponding traits) can mask the expression of recessive alleles (and their traits) in a heterozygous genotype.

Answer:

recessive