Results 161 to 170 of about 8,207 (204)
Does diploidy increase the rate of adaptation? [PDF]
Genetics, 1994 Abstract Explanations of the evolution of diploidy have focused on the advantages gained from masking deleterious alleles. Recent theory has shown, however, that masking does not always provide an advantage to diploidy and would never favor diploidy in predominantly asexual organisms.
Sarah P. Otto, H A Orr
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Somatic mutation favors the evolution of diploidy. [PDF]
Genetics, 1995 Abstract Explanation of diploidy have focused on advantages gained from masking deleterious mutations that are inherited. Recent theory has shown that these explanations are flawed. Indeed, we still lack any satisfactory explanation of diploidy in species that are asexual or that recombine only rarely. Here I consider a possibility first
H A Orr
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Genetic Error, Sex, and Diploidy
Journal of Heredity, 1993Mathematical models and experiments on transformation are reported testing the hypothesis that sex and diploidy evolved as a DNA repair system. The models focus on the origin of diploidy and sex by studying selection between asexual haploids, sexual haploids, and diploids.
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Haploidy or diploidy: which is better?
Nature, 1991Although the evolutionary advantages of sexual reproduction have been extensively discussed, much less attention has been paid to haploid and diploid phases of the sexual life cycle. The relative lengths of these phases differ greatly in various taxa, including as extremes those with one or the other phase reduced to a single cell. Here we consider the
A S, Kondrashov, J F, Crow
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Acta Biotheoretica, 1983
Under the influence of deleterious mutation and selection a population will reach equilibrium and contain individuals with [0, 1, 2 - - mutations.] This deterministic equilibrium distribution is exactly the same for asexual and sexual populations. The size of the optimal class (no), i.e. the class with the smallest number of mutations, is determined by
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Under the influence of deleterious mutation and selection a population will reach equilibrium and contain individuals with [0, 1, 2 - - mutations.] This deterministic equilibrium distribution is exactly the same for asexual and sexual populations. The size of the optimal class (no), i.e. the class with the smallest number of mutations, is determined by
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On the potential for genetic variability in haplo-diploidy
Genetica, 1970Some theory pertaining to the genetic variability of haplo-diploid species is examined. Genetic variability due to wholly deleterious alleles is reduced in haplo-diploid species compared with species with both sexes diploid, but a random numbers experiment suggests that there is no a priori reason to believe haplo-diploidy reduces the likelihood of ...
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Haploidy, Diploidy, and Polyploidy
1980Haploidy is a general term for designating individuals or tissues (in mosaics) that have somatic cells with a gametic chromosome number (n).
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Diploidy, Population Structure, and the Evolution of Recombination
The American Naturalist, 2009In diploids, sex affects genetic variation through segregation and recombination. Several recent models on the advantage of recombination have focused on the effect of interaction between selection and drift in finite or structured populations; however, these models considered haploid organisms.
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Diploidy and repair of radiation damage in saccharomyces mutants
Mutation Research, 1973Abstract Diploid wild-type cells of Saccharomyces and cells homozygous for one of the single genes r s 1 , r s 2 of the two alleles of the r s 3 gene (rad 2 gene) were tested for their response to ionizing irradiation in the presence and absence of oxygen. Both immediate and delayed plating (agar-holding) techniques were used.
D, Averbeck, M, Ebert
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Probable spermatozoal diploidy in the semen of a golden retriever
Andrologia, 2009The semen of a 3-year-old golden retriever was examined for breeding purposes. When the morphology of the spermatozoa was analysed for the first time, 37% were observed to have giant heads. In most of the giant heads, a diadem defect was also found. The dog was successfully used for breeding.
M, Dahlbom +4 more
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