Meiosis160-page4 - • In protists which remain single cell...

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Meiosis and Life Cycles - 4 Diploid Life Cycle In animals, meiosis generally produces just haploid sex cells, which at fertilization start the next generation. The only haploid cells of the animal are egg or sperm, and the respective maturation processes are called oogenesis and spermatogenesis. When gametes fuse, the zygote grows by mitosis producing the adult stage. All cells will be diploid. The animal life cycle is a diploid life cycle. Haploid Life Cycle In many protists, and some fungi, haploid gametes fuse to form a zygote, but the zygote immediately does meiosis forming single haploid cells.
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Unformatted text preview: • In protists, which remain single cell organisms, the nucleus is then haploid. • At some time, the single cells may just decide to become gametes and fuse with another to make a zygote, or haploid cells may do mitosis to make more individuals asexually. • Haploid life cycles can be more complex. Fungi, and some algae may make multicellular haploid organisms from single-celled meiotic product, by mitosis. At some time, special areas of the haploid body will become gamete-making structures, and haploid gametes are formed by mitosis....
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This note was uploaded on 12/29/2011 for the course BIO 151 taught by Professor Edwards during the Spring '10 term at SUNY Stony Brook.

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