Parthenogenesis in Animals

Suomalainen, Esko

doi:10.1016/s0065-2660(08)60086-3

Cited by 238 publications

(118 citation statements)

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“…A striking example is the loss of the male sex in a diploid species, so that genetic continuity depends wholly on females reproducing by thelytokous parthenogenesis (1). Frequently, the loss of potential for recombination is complete, as in cases where an ameiotic system of retaining diploidy is substituted for meiosis and bisexual reproduction.…”

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confidence: 99%

The Genetic System in Parthenogenetic Strains of Drosophila mercatorum

Carson

1973

Proc. Natl. Acad. Sci. U.S.A.

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Five parthenogenetic laboratory strains of Drosophila mercatorum have been examined for their mode of diploidization in the eggs of females. Diploidization occurs either by pronuclear duplication leading to complete homozygosity or by nuclear fusion. If the latter occurs between pronuclei from different secondary oocytes, heterozygosity can be maintained. Each of the five strains shows some nuclear fusion and three show significantly different amounts, ranging from about 21% to less than 1%. Even in strains with a strong tendency towards homozygosity, it is argued that this dual system of nuclear reconstitution provides for genetic recombination; thus, the strains retain considerable evolutionary potential.

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confidence: 99%

The Genetic System in Parthenogenetic Strains of Drosophila mercatorum

Carson

1973

Proc. Natl. Acad. Sci. U.S.A.

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“…In ameiotic parthenogenesis, meiosis is absent, chromosome reduction does not take place, with the diploid chromosome number being maintained (Suomalainen 1950;White 1973;Suomalainen etal. 1976;Bell 1982).…”

Section: Introductionmentioning

confidence: 99%

“…Genetic recombination is also absent White (1973) suggests that in such a system any genetical heterozygosity which exists will be perpetuated from generation to generation and, in fact, as more and more mutations occur, heterozygosity must be expected to increase without limit Mutations cannot become homozygous unless an identical mutation occurs in the same generation. Ameiotic parthenogens are thus assumed to be "heterozygote-promoting" (Suomalainen 1950(Suomalainen , 1961(Suomalainen 1962White 1970). All the offspring of a singl~ individual will be genetically identical to the parent and to each other, barring mutation, environmental, and cytoplasmic influences (Ho 1984), or various other non-nuclear genetic components (pollard 1984).…”

Section: Introductionmentioning

confidence: 99%

Genetics ofPotamopyrgus antipodarum(Gastropoda: Prosobranchia): Variation in unisexual populations

Phillips

Lambert

1990

New Zealand Journal of Zoology

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The New Zealand gastropod Potamopyrgus antipodarum comprises both unisexual and bisexual populations. The aim of this study was to examine the genetic variation of unisexual populations and to determine whether the variation observed was consistent with the predictions of ameiotic or meiotic parthenogenesis. Genetic variation within and among eight unisexual populations of P. antipodarum (four from. the Auckland region and four from the Rotorua reglon) was examined for seven presumptive loci. Theresults indicated extreme genetic divergence both within populations, among populatio~ within ~h ~gion, and between regions. In many mstances a Slgmficant excess ofheterozygotes was noted, suggesting ameiotic parthenogenesis. The fm~g o~ genetic

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“…It is characterized by the embryonic development of female eggs without previous fertilization by the male gamete (Soumalen 1950).…”

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confidence: 99%