How are the male gametes of gymnosperms formed? What is the relationship between the pollen grains and the concept of alternation of generations?

1 year ago

In the male strobiles (cones) there are microsporophylls (fertile leaves of the strobile) that contain microsporangia. Within the microsporagium spore mother cells undergo meiosis and generate haploid microspores. The microspore wall develops into winglike projections (to facilitate its aerial propagation) and mitosis occurs producing two cells, the generative cell and the tube cell. The final structure containing these elements is the pollen grain. The pollen grain relates to the alternation of generations since it is the male gametophyte (the haploid stage of the life cycle).

Dipti KC
May 26, 2023
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