ENZYME POLYMORPHISM AND CYCLIC PARTHENOGENESIS IN DAPHNIA MAGNA. II. HETEROSIS FOLLOWING SEXUAL REPRODUCTION | Zendy

J. Peter W. Young | Zendy

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ENZYME POLYMORPHISM AND CYCLIC PARTHENOGENESIS IN DAPHNIA MAGNA. II. HETEROSIS FOLLOWING SEXUAL REPRODUCTION

Author(s) -

J. Peter W. Young

Publication year - 1979

Publication title -

genetics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.792

H-Index - 246

eISSN - 1943-2631

pISSN - 0016-6731

DOI - 10.1093/genetics/92.3.971

Subject(s) - biology , parthenogenesis , heterozygote advantage , cladocera , fecundity , genetics , daphnia magna , daphnia , linkage disequilibrium , natural selection , sexual reproduction , population , heterosis , sexual selection , evolutionary biology , zoology , allele , crustacean , haplotype , gene , botany , embryo , demography , toxicity , hybrid , sociology , chemistry , organic chemistry

Cyclical parthenogenesis exaggerates the force of selection relative to recombination and will therefore enhance interlocus effects. Observations of electrophoretic variation in a natural population of Daphnia magna Straus (Crustacea: Cladocera) are interpreted in this light. Sexual reproduction led to Hardy-Weinberg equilibrium, but heterozygote excesses rapidly developed at each of three observed loci during subsequent parthenogenesis. Homozygote fecundity was often lower than that of heterozygotes; this may have been the cause of some of the observed frequency changes. The superior fitness of the enzyme heterozygotes does not imply that selection was necessarily acting on the enzyme loci themselves, since apparent heterosis is the expected result of linkage disequilibrium.

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