Results 241 to 250 of about 23,281 (295)

Stepwise emergence of recombination suppression precedes fissiparous asexuality in the planarian Schmidtea mediterranea

Brand JN, Bharatraj Patil A, Pandolfini L, Zadesenetz K, Rubtov N, Robledillo L, Zhang M, Marques A, Rink JC.   +8 more
europepmc   +1 more source

Asexual Reproduction in Sponges: A Review

Molecular Reproduction and Development
ABSTRACT Sponges (phylum Porifera) are an early‐branching lineage of Metazoa. The long independent evolution of sponges makes them an essential group for comparative studies of the emergence and early evolution of various aspects of metazoan biology, including asexual reproduction.
Alexander V. Ereskovsky, Andrey I. Lavrov   +1 more
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Asexual reproduction in the Hydrozoa (Cnidaria)

, 2002
A thorough review of asexual reproduction patterns of ...
BOERO, Ferdinando, J. BOUILLON, PIRAINO, Stefano, V. SCHMID   +3 more
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Asexual Reproduction in a Sipunculan Worm

Science, 1970
The sipunculan worm Aspidosiphon brocki reproduces asexually by transverse fission into two unequal parts, the smaller part comprising the posterior fifth of the animal. Prior to fission each part regenerates the structures essential to the formation of a new individual.
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Constraints on the evolution of asexual reproduction

BioEssays, 2008
AbstractSexual reproduction is almost ubiquitous among multicellular organisms even though it entails severe fitness costs. To resolve this apparent paradox, an extensive body of research has been devoted to identifying the selective advantages of recombination that counteract these costs.
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Asexual reproduction of planarians: Metric studies

Russian Journal of Developmental Biology, 2006
A relationship was studied between fission and restoration of body and its individual parts under different experimental conditions in planarians of the Dugesia tigrina asexual race. The body and its fragments were studied morphomterically. After fission, the growth of planarians demonstrated topographic differences.
I M, Sheĭman, Z V, Sedel'nikov, M F, Shkutin, N D, Kreshchenko   +3 more
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Asexual reproduction in the suctorianDiscophrya collini

Protoplasma, 1982
Discophrya collini reproduces asexually through the formation of a ciliated swarmer by evaginative budding. This process is initiated by the repeated replication of a single subcortical kinetosome to form a kinetosome field. The epiplasm of the multilayered cortex covering this field becomes reduced in thickness and the whole cortex invaginates to ...
A. Curry, R. D. Butler
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Asexual reproduction in protozoa and invertebrates

Journal of Theoretical Biology, 1982
Abstract A model which defines fitness in terms of rate of clone increase, and which assumes constant mortality, predicts that more smaller offspring should be produced in conditions which are good for individual growth. Evidence from the Protozoa, freshwater flatworms and anthozoan cnidarians support this prediction. Fitness is maximized by budding
Richard Sibly, Peter Calow
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Asexual reproduction in Phytophthora erythroseptica

Transactions of the British Mycological Society, 1966
Sporangia are readily produced by Phytophthora erythroseptica Pethybr. when mycelial mats are grown in pea broth, washed and transferred to shallow layers of water or Petri's solution. Sporulation occurs between 8 and 26 ° C., (opt. c . 18–22 ° C.). Aeration of water is not necessary for sporangial production.
Radmila Vujičić, John Colhoun
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