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The evolution of life cycles with haploid and diploid phases

✍ Scribed by Barbara K. Mable; Sarah P. Otto

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
125 KB
Volume
20
Category
Article
ISSN
0265-9247

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✦ Synopsis

Sexual eukaryotic organisms are characterized by an alternation between haploid and diploid phases. In vascular plants and animals, somatic growth and development occur primarily in the diploid phase, with the haploid phase reduced to the gametic cells. In many other eukaryotes, however, growth and development occur in both phases, with substantial variability among organisms in the length of each phase of the life cycle. A number of theoretical models and experimental studies have shed light on factors that may influence life cycle evolution, yet we remain far from a complete understanding of the diversity of life cycles observed in nature. In this paper we review the current state of knowledge in this field, and touch upon the many questions that remain unanswered.

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AS was previously found to be a liver-synthesized serum protein that is found in the larval (ammocoete), metamorphosing, and juvenile individuals during the life cycle of Petromyzon marinus but not in the sexually mature upstream-migrant individuals (Filosa et al. [1982] Comp. Biochem. Physiol., 72B