Converse of object

• allow: These conditions allow the inconspicuous gametophyte ( about the size of a finger nail ) to develop and undergo fertilization.

Adjective modifier

• male: One approach would be to engineer pollen lethality by taking advantage of promoters that are active specifically in the male gametophyte.

Modifies a noun

• generation: Pollen grains represent the vestiges of a highly reduced male gametophyte generation.

• plant: This is the structure on the gametophyte plant that contains the female gametes.