ABSTRACT
Sexual strains of Dugesia tigrina display a seasonal development of sex organs in late summer or autumn and lay cocoons in the suceeding spring. This is followed by a period of asexual reproduction in mid-summer. Such a seasonal alternation of reproductive pathways makes this flatworm an ideal subject of inquiry into the inductive mechanisms controlling reproduction and its ultimate coupling to changes in the environment. Asexual strains of this species reproduce by fission only.
copyright © 1970 by Company of Biologists
1970
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