Observations on an Achlya Lacking Sexual Reproduction
نویسندگان
چکیده
منابع مشابه
Sexual Hormones in Achlya
The sexual reproductive process of Achlya ambisexualis, a heterothallic form belonging to a well known and widely distributed genus of saprophytic aquatic fungi, is initiated and coordinated by means of specific substances (Raper, 1939, a). Four of these substances have been demonstrated (Raper, 1939, b, 1940) in the r&es of initiators and coordinators of the various stages in the sexual proces...
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In a previous work (WeinshalI1986), a model for competition between sexually reproducing and asexually reproducing (e.g., vegetative or parthenogenetic) individuals of the same diploid population was investigated. It was assumed that the population periodically undergoes n modes of selection (e.g., it is periodically infested by n sorts of parasite; see Haldane 1949;Maynard Smith 1978;Hamilton ...
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The prevalence of sexual reproduction (" sex ") in eukaryotes is an enigma of evolutionary biology. Sex increases genetic variation only tells its long-term superiority in essence. The accumulation of harmful mutations causes an immediate and ubiquitous pressure for organisms. Contrary to the common sense, our theoretical model suggests that reproductive rate can influence the accumulation of h...
متن کاملSidrak on reproduction and sexual love.
A NUMBER OF ExTRAcrs from the medieval didactic dialogue of Sidrak and Bokkus, on the subject of reproduction, appeared in these pages in 1967.1 The manuscript from which the extracts were taken (British Museum MS. Lansdowne 793) is the fullest known English version of this work, but it contains some anomalies which, in places, obscure the meaning. In such cases it is helpful to compare the wor...
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ژورنال
عنوان ژورنال: American Journal of Botany
سال: 1917
ISSN: 0002-9122
DOI: 10.2307/2435134