AP BIOLOGY

Detailed explanation-1: -Diploid sporophyte cells undergo meiosis to produce haploid spores. Each spore goes through mitotic divisions to yield a multicellular, haploid gametophyte. Mitotic divisions within the gametophyte are required to produce the gametes. The diploid sporophyte results from the fusion of two gametes.

Detailed explanation-2: -The sexual phase is the gametophyte. In the sporophyte phase a diploid (having two sets of chromosomes) plant body grows and eventually produces spores through meiosis. These spores divide mitotically to produce haploid (having a single set of chromosomes) gamete-producing bodies called gametophytes.

Detailed explanation-3: -On the sporophyte, specialized structures called sporangia form, and inside of them, haploid cells (spores, 1n) are formed by meiosis.

Detailed explanation-4: -During the sporophyte stage, the plant produces spores with diploid or two sets of chromosomes (2n) by the process of mitosis. These spores later develop into gametophytes that produce gametes having a haploid or single set of chromosomes (n) by the process of meiosis.

Detailed explanation-5: -Alternation of generations means that plants alternate between two different life stages, or generations, in their life cycle; a haploid stage called gametophyte and a diploid stage called sporophyte.