6 found
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  1.  12
    Fluctuating Asymmetry and Aggression in Boys.J. T. Manning & D. Wood - 1998 - Human Nature 9 (1):53-65.
    Fluctuating asymmetry (FA) is small deviations from perfect symmetry in normally bilaterally symmetrical traits. We examined the relationship between FA of five body traits (ear height, length of three digits, and ankle circumference) and self-reported scores of physical and verbal aggression in a sample of 90 boys aged 10 to 15 years. The relationships between FA and scores of aggression (particularly physical aggression) were found to be negative; in other words, the most symmetrical boys showed highest aggression. One trait (ankle (...)
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  2.  18
    Muller's Ratchet and the Accumulation of Favourable Mutations.J. T. Manning & D. J. Thompson - 1984 - Acta Biotheoretica 33 (4):219-225.
    Under the influence of recurrent deleterious mutation and selection, asexual and sexual populations reach a deterministic equilibrium with individuals carrying 0,1,2,. . . harmful mutations. When a favourable mutation (aA) occurs in an asexual population it will usually occur in an individual who has one or more (k) deleterious mutations. Muller's ratchet then applies as A will thereafter never occur in an individual with less than k mutations. If the selective advantage of A is less than the selective disadvantage of (...)
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  3.  14
    Diploidy and Muller's Ratchet.J. T. Manning - 1983 - Acta Biotheoretica 32 (4):289-292.
    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 , i.e. the class with the smallest number of mutations, is determined by the genome mutation rate and the average selective disadvantage of the mutations. A large U and small s gives a very small n o. If n (...)
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  4.  10
    Environmental Change, Mutational Load and the Advantage of Sexual Reproduction.J. T. Manning & D. P. E. Dickson - 1986 - Acta Biotheoretica 35 (3):149-162.
    There is evidence that asexual reproduction has a long-term disadvantage when compared to sexual reproduction. This disadvantage is usually assumed to arise from the more efficient incorporation of advantageous mutations by sexual populations. We consider here the effect on asexual and sexual populations of changes in the fitness of harmful mutations. It is shown that the re-establishment of equilibrium following environmental change is generally faster in sexual populations, and that the mutational load experienced by the sexual population can be significantly (...)
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  5.  24
    Life Cycle Patterns and Their Genetic Control: An Attempt to Reconcile Evolutionary and Mechanistic Speculation.J. T. Manning - 1976 - Acta Biotheoretica 25 (2-3):111-129.
    A model is proposed which implicates molecular recognition systems as the major controlling factors in life cycle expression. It is envisaged that such systems are important in immune functioning and catabolic, metabolic molecule recognition at both inter- and intea-cellular level. These recognition systems have the following characteristics: Specific recognition molecules , e.g. vertebrate antibodies, invertebrate agglutinins and plant agglutinins may recognise specific substances, e.g. antigens, catabolic and metabolic molecules. The range of possible recognisable substances is very wide and variable. The (...)
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  6. Parental Income Inequality and Children’s Digit Ratio (2D:4D): A ‘Trivers-Willard’ Effect on Prenatal Androgenization?J. T. Manning, B. Fink, L. Mason & R. Trivers - forthcoming - Journal of Biosocial Science:1-9.
    Income inequality is associated positively with disease prevalence and mortality. Digit ratio – a negative proxy for prenatal testosterone and a positive correlate of prenatal oestrogen – is related to several diseases. This study examined the association of income inequality and children’s 2D:4D. Participants self-measured finger lengths in a large online survey conducted in July 2005 and reported their parents’ income. Children of parents of above-average income had low 2D:4D while the children of parents of below-average income had high 2D:4D. (...)
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