the argument. (i)each offspring derives half its genes from its mother and half from its father...

The Argument

(i) Each offspring derives half its genes from its mother and half from its father (Equal Contribution of Parents)

The Argument

(ii) Each offspring / successful mating gives one ‘credit’ to a female and one ‘credit’ to a male (Equal Payoff for Parents)

The Argument

(iii) The total success of all females is equal to the total success of all males (Equal Payoff for Sexes)

The Argument

(iv) ‘Individuals’ of the rarer sex are fitter than ‘individuals’ of the common sex (Higher Success for Rarer-Sex Individuals)

The Argument

(v) Returns from investment into rarer sex higher than from common sex (Higher Returns from Rarer Sex)

The Argument

(vi) Natural selection favours individuals that invest into rarer sex (Best Investment Strategy)

The Argument

(vi) Natural selection favours individuals that invest into rarer sex (Best Investment Strategy)

(vii) Natural selection neutralises perturbations from equal investment in the sexes (Convergence on Even Sex Ratio)

The Argument

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Equal contribution of parents

Equal payoff for parents

Equal payoff for sexes

Higher success of rare sex ‘individuals’

Higher returns from rarer sex

Best investment strategy

Convergence on even sex ratio

The Argument

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Darwin (1871)

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Darwin (1871)

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Darwin (1871)

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Darwin (1871)

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Darwin (1871)

viiTransmit the tendency to future generations

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Darwin (1871)

viiiTransmit the tendency to future generations

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Düsing (1884)

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Düsing (1884)

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Düsing (1884)

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Düsing (1884)

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Düsing (1884)

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Düsing (1884)

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Behavioural adjustment towards equal sex ratio

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Gini (1908)

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Gini (1908)

“it has all the appearance of being valid, but only the appearance”

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Cobb (1914)

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Cobb (1914)

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Cobb (1914)

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Cobb (1914)

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Cobb (1914)

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Cobb (1914)

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Cobb (1914)

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Fisher (1930)

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Fisher (1930)

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Fisher (1930)

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the argument. (i)each offspring derives half its genes from its mother and half from its father...

Documents

equal investment

common sex higher success

male equal payoff

rarersex individuals

males equal payoff

sex ratio

common sex higher returns

parents iiithe total