![]() This cycle is known as alternation of generations. Two gametes fuse to form a zygote which develops into a new sporophyte. ![]() Under favourable conditions the spore can develop into a new organism using mitotic division, producing a multicellular gametophyte, which eventually goes on to produce gametes. Spores are usually haploid and unicellular and are produced by meiosis in the sporangium of a diploid sporophyte. In bacteria, spores are not part of a sexual cycle but are resistant structures used for survival under unfavourable conditions. Spores form part of the life cycles of many plants, algae, fungi and protozoa. By contrast, gametes are units of sexual reproduction. In biology, a spore is a unit of asexual reproduction that may be adapted for dispersal and for survival, often for extended periods of time, in unfavorable conditions. ![]() Freebase (0.00 / 0 votes) Rate this definition: ![]()
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