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The term "alternation of generations" refers to the lifecycle of plants that involves two types of plant bodies: gametophyte and sporophyte.

The haploid multicellular gametophyte alternates with the diploid multicellular sporophyte.

Meiosis produces haploid cells, which are represented by 1n, while mitosis produces diploid cells.

A haploid structure is a gametophyte or spore, but a seed can never be haploid. Like a sporophyte, it is diploid.

Because a gametophyte and spore are always haploid in nature, and a sporophyte is always diploid, a 2n, 1n, 2n, 1nsituation is not possible.

Meiosis, a process that reduces the number of chromosomes to half, produces haploid spores in a mature diploid sporophyte.

These haploid spores germinate, resulting in a haploid gametophyte. To make haploid gametes, the gametophyte goes through mitosis.

A diploid zygote is created when two gametes unite and are fertilized. The zygote develops into a seed.

As a result, a seed grows into a diploid sporophyte under the diploid condition.

As a result, the ploidy of the gametophyte, seed, spores, and sporophyte are

1n, 2n, 1n and 2n respectively.