Wiktionary
monohybrid
n. A hybrid between two species that only have a difference of one gene.
WordNet
monohybrid
n. a hybrid produced by crossing parents that are homozygous except for a single gene locus that has two alleles (as in Mendel's experiments with garden peas)
Wikipedia
Usage examples of "monohybrid".
It must be remembered, in attempting to fix favorable characteristics, that a monohybrid cross gives rise to four possible recombinant genotypes, a dihybrid cross gives rise to 16 possible recombinant genotypes, and so forth.