Genetic variation and asexual reproduction in the facultatively parthenogenetic cockroach nauphoeta cinerea

Implications for the evolution of sex

L. S. Corley, Jill R Blankenship, A. J. Moore

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Asexual reproduction could offer up to a two-fold fitness advantage over sexual reproduction, yet higher organisms usually reproduce sexually. Even in facultatively parthenogenetic species, where both sexual and asexual reproduction is sometimes possible, asexual reproduction is rare. Thus, the debate over the evolution of sex has focused on ecological and mutation-elimination advantages of sex. An alternative explanation for the predominance of sex is that it is difficult for an organism to accomplish asexual reproduction once sexual reproduction has evolved. Difficulty in returning to asexuality could reflect developmental or genetic constraints. Here, we investigate the role of genetic factors in limiting asexual reproduction in Nauphoeta cinerea, an African cockroach with facultative parthenogenesis that nearly always reproduces sexually. We show that when N. cinerea females do reproduce asexually, offspring are genetically identical to their mothers. However, asexual reproduction is limited to a nonrandom subset of the genotypes in the population. Only females that have a high level of heterozygosity are capable of parthenogenetic reproduction and there is a strong familial influence on the ability to reproduce parthenogenetically. Although the mechanism by which genetic variation facilitates asexual reproduction is unknown, we suggest that heterosis may facilitate the switch from producing haploid meiotic eggs to diploid, essentially mitotic, eggs.

Original languageEnglish (US)
Pages (from-to)68-74
Number of pages7
JournalJournal of Evolutionary Biology
Volume14
Issue number1
DOIs
StatePublished - Mar 1 2001

Fingerprint

Nauphoeta cinerea
Asexual Reproduction
cockroach
Cockroaches
asexual reproduction
Blattodea
genetic variation
gender
sexual reproduction
Reproduction
Eggs
Parthenogenesis
egg
Hybrid Vigor
parthenogenesis
heterosis
Haploidy
organisms
Diploidy
heterozygosity

Keywords

  • Developmental constraints
  • Evolution of sex
  • Heterozygosity
  • Quantitative genetics

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

Cite this

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