What term describes the parents in a monohybrid cross? They are true-breeding plants. They carry a hidden allele. They differ in a single trait. They carry the dominant trait.

Ans.

A monohybrid cross can be defined as 'a cross between two individuals having different copies of a chromosome or gene of interest, which is responsible for variations in a single trait.'

These variations in a single trait are controlled by two or more alleles for a single chromosomes. For example, a cross between tall pea plant and dwarf pea plant to study the inheritance of plant height.

Thus, the correct answer is 'option). they differ in a single trait.'