monohybrid

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)

2つの対立遺伝子を持つ単一の遺伝子座を除いてホモ接合体である両親を交配して生じる雑種（メンデルのエンドウ豆の実験のようなもの）