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Titolo:
EVOLUTION OF THE ALTERNATION OF HAPLOID AND DIPLOID PHASES IN LIFE-CYCLES .2. MAINTENANCE OF THE HAPLO-DIPLONTIC CYCLE
Autore:
RICHERD S; COUVET D; VALERO M;
Indirizzi:
UNIV LILLE 1,GENET & EVOLUT POPULAT VEGETALES LAB,CNRS,URA 1185 F-59655 VILLENEUVE DASCQ FRANCE
Titolo Testata:
Journal of evolutionary biology
fascicolo: 2, volume: 6, anno: 1993,
pagine: 263 - 280
SICI:
1010-061X(1993)6:2<263:EOTAOH>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Keywords:
EVOLUTION OF HAPLO-DIPLOIDY; LIFE CYCLES VARIATION; ALTERNATION OF GENERATIONS; COST OF SEX; ALGAE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
NO
Recensione:
Indirizzi per estratti:
Citazione:
S. Richerd et al., "EVOLUTION OF THE ALTERNATION OF HAPLOID AND DIPLOID PHASES IN LIFE-CYCLES .2. MAINTENANCE OF THE HAPLO-DIPLONTIC CYCLE", Journal of evolutionary biology, 6(2), 1993, pp. 263-280

Abstract

The relative duration of the haploid and the diploid phases during the reproductive cycle varies greatly between organisms. This paper addresses the question of the evolution of haploid, diploid, and haplo-diplontic life cycles. When the life span of haploid and diploid individuals is constant whatever their cycle, we show that the haplo-diplonticcycle has an advantage, which depends on the sex-ratio in anisogamousspecies and on the probability of fertilization in isogamous species. This is because meiosis and fertilization occur half as often in the haplo-diplontic cycle as in haploid or diploid cycles, for the same number of generations of individuals. This argument is demonstrated using a model which considers a genetic determination of the cycle, and fixed haploid and diploid fitnesses. The relevance of measures of fitness of haploid and diploid individuals in predicting the evolution of life cycles is discussed. Measures obtained in algae are compared with theoretical predictions.

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Documento generato il 10/07/20 alle ore 15:47:23