When a cross is made between two parents with respect to a single character, it is called_______.
monohybrid
A monohybrid cross is a genetic cross using a single trait with two alleles. This cross can be done between two individuals of a pure line (that are homozygous for a single trait) or hybrids (heterozygous for the trait).
Example: Cross between a tall plant and a dwarf plant is a monohybrid cross.