. Animal growth and development. Embryology; Growth; Biology; Growth; Embryology; Animals -- growth & development. The Life Cycle of the Single Cell 13 In higher animals, reproduction is tied to the sexual fusion of gam- etes. Human beings cannot bud or fragment. They must mate to reproduce their kind. In yeast cells, as in other microorganisms, sexual fusion is separate from reproduction. Yeast grow by asexual means, but under special conditions do employ sexual fusion to produce genetic recom- binants (, new varieties). The life cycle of yeast is illustrated schematically in Fig. 4.
. Animal growth and development. Embryology; Growth; Biology; Growth; Embryology; Animals -- growth & development. The Life Cycle of the Single Cell 13 In higher animals, reproduction is tied to the sexual fusion of gam- etes. Human beings cannot bud or fragment. They must mate to reproduce their kind. In yeast cells, as in other microorganisms, sexual fusion is separate from reproduction. Yeast grow by asexual means, but under special conditions do employ sexual fusion to produce genetic recom- binants (, new varieties). The life cycle of yeast is illustrated schematically in Fig. 4. The diploid individual is an elliptical cell. It reproduces asexually by budding and can do so indefinitely as long as it is supplied with nutrient materials and given conditions beneficial for growth. Under adverse conditions (when starved and unable to bud), the diploid cell undergoes meiosis to produce four haploid individuals. These are surrounded by thick walls and are resistant to drying, heat, ultraviolet radiation, etc. They are called Fig. 4. The life cycle of yeast. Life cycle of Sacctiaromyces cerevisiae Two haploid cells of different sexes. Schizosoccharomyces octosporus Hansenula anomola The variety of osci and ascospores seen in different species of yeast Spermophthora gossypii. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Sussman, Maurice. Englewood Cliffs, N. J. , Prentice-Hall
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