BISC 102 Chapter Notes - Chapter 23, 31: Saccharomyces Cerevisiae, Dikaryon, Hypha
19 Jan 2018
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Animals: gametes produced by differentiation that occurs in products of meiosis. Plants: haploid cells produced by meiosis reproduce a few times before becoming gametes. (a) male reproductive organs of flowering plants: diploid cells undergo meiosis to form haploid cells. Haploid cells divide by mitosis to produce tiny, multicellular pollen grains. One of the haploid cells in pollen grain will divide by mitosis. Result = 2 sperm cells. (b) events leading to egg formation in flowering plants. Surviving cell divides by meiosis several times, produces tiny, multicellular embryo sac. Inside embryo sac, haploid cell differentiates into egg. Alternation of generations in a diploid, multicellular plant. Fungi may produce swimming gametes and spores, yoked hyphae, where nuclei from different individuals fuse to form a zygote inside a protective structure, or specialized spore-producing cells called basidia and asci. Spores as key reproductive cells spore is most fundamental reproductive cell in fungi. Spores are dispersal stage and are produced during asexual + sexual reproduction.
