Angiosperm Life Cycle

In angiosperms, the sporophyte generation is dominant and produces the gametophyte generation within its body. Meiosis in the anthers of the flower produces haploid spores that undergo mitosis and form the male gametophytes or pollen grains. Meiosis in the ovule produces a haploid spore that undergoes mitosis and forms the few cells of the female gametophyte, one of which becomes an egg. Pollination occurs when a pollen grain, carried by the wind or an animal, lands on the stigma. As in gymnosperms, a tube grows from the pollen grain to the ovule, and a sperm fertilizes the egg, forming a zygote. A seed develops from each ovule. While the seeds develop, the ovary's wall thickens, forming the fruit that encloses the seeds. When conditions are favorable, a seed germinates, which means it began to grow. Biology book pg 351

 

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