人类的手和大象的前腿是同源器官，它们都源自相似的祖先结构。

The human hand and the elephant's front leg are ___homologous organs, both derived from similar ancestral structures.

这些同源染色体在减数分裂过程中会相互配对。

These ___homologous chromosomes will pair with each other during meiosis.

甲醇和乙醇属于醇类的同系物，具有相似的性质。

Methanol and ethanol are members of the ___homologous series of alcohols with similar properties.