the argument. (i)each offspring derives half its genes from its mother and half from its father...
TRANSCRIPT
(i) Each offspring derives half its genes from its mother and half from its father (Equal Contribution of Parents)
The Argument
(i) Each offspring derives half its genes from its mother and half from its father (Equal Contribution of Parents)
(ii) Each offspring / successful mating gives one ‘credit’ to a female and one ‘credit’ to a male (Equal Payoff for Parents)
The Argument
(i) Each offspring derives half its genes from its mother and half from its father (Equal Contribution of Parents)
(ii) Each offspring / successful mating gives one ‘credit’ to a female and one ‘credit’ to a male (Equal Payoff for Parents)
(iii) The total success of all females is equal to the total success of all males (Equal Payoff for Sexes)
The Argument
(i) Each offspring derives half its genes from its mother and half from its father (Equal Contribution of Parents)
(ii) Each offspring / successful mating gives one ‘credit’ to a female and one ‘credit’ to a male (Equal Payoff for Parents)
(iii) The total success of all females is equal to the total success of all males (Equal Payoff for Sexes)
(iv) ‘Individuals’ of the rarer sex are fitter than ‘individuals’ of the common sex (Higher Success for Rarer-Sex Individuals)
The Argument
(i) Each offspring derives half its genes from its mother and half from its father (Equal Contribution of Parents)
(ii) Each offspring / successful mating gives one ‘credit’ to a female and one ‘credit’ to a male (Equal Payoff for Parents)
(iii) The total success of all females is equal to the total success of all males (Equal Payoff for Sexes)
(iv) ‘Individuals’ of the rarer sex are fitter than ‘individuals’ of the common sex (Higher Success for Rarer-Sex Individuals)
(v) Returns from investment into rarer sex higher than from common sex (Higher Returns from Rarer Sex)
The Argument
(i) Each offspring derives half its genes from its mother and half from its father (Equal Contribution of Parents)
(ii) Each offspring / successful mating gives one ‘credit’ to a female and one ‘credit’ to a male (Equal Payoff for Parents)
(iii) The total success of all females is equal to the total success of all males (Equal Payoff for Sexes)
(iv) ‘Individuals’ of the rarer sex are fitter than ‘individuals’ of the common sex (Higher Success for Rarer-Sex Individuals)
(v) Returns from investment into rarer sex higher than from common sex (Higher Returns from Rarer Sex)
(vi) Natural selection favours individuals that invest into rarer sex (Best Investment Strategy)
The Argument
(i) Each offspring derives half its genes from its mother and half from its father (Equal Contribution of Parents)
(ii) Each offspring / successful mating gives one ‘credit’ to a female and one ‘credit’ to a male (Equal Payoff for Parents)
(iii) The total success of all females is equal to the total success of all males (Equal Payoff for Sexes)
(iv) ‘Individuals’ of the rarer sex are fitter than ‘individuals’ of the common sex (Higher Success for Rarer-Sex Individuals)
(v) Returns from investment into rarer sex higher than from common sex (Higher Returns from Rarer Sex)
(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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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
Darwin (1871)
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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
Darwin (1871)
i
ii
iii
iv
v
vi
vii
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
Darwin (1871)
i
ii
iii
iv
v
vi
vii
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
Darwin (1871)
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ii
iii
iv
v
vi
vii
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
Darwin (1871)
viiTransmit the tendency to future generations
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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
Darwin (1871)
viiiTransmit the tendency to future generations
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ii
iii
iv
v
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vii
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
Düsing (1884)
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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
Düsing (1884)
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ii
iii
iv
v
vi
vii
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
Düsing (1884)
i
ii
iii
iv
v
vi
vii
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
Düsing (1884)
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ii
iii
iv
v
vi
vii
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
Düsing (1884)
i
ii
iii
iv
v
vi
vii
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
Düsing (1884)
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Behavioural adjustment towards equal sex ratio
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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
Cobb (1914)
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ii
iii
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v
vi
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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
Cobb (1914)
i
ii
iii
iv
v
vi
vii
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
Cobb (1914)
i
ii
iii
iv
v
vi
vii
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
Cobb (1914)
i
ii
iii
iv
v
vi
vii
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
Cobb (1914)
i
ii
iii
iv
v
vi
vii
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
Cobb (1914)
viiiTransmit the tendency to future generations
i
ii
iii
iv
v
vi
vii
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
Cobb (1914)
viiiTransmit the tendency to future generations
i
ii
iii
iv
v
vi
vii
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
Fisher (1930)
i
ii
iii
iv
v
vi
vii
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
Fisher (1930)
i
ii
iii
iv
v
vi
vii
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
Fisher (1930)
i
ii
iii
iv
v
vi
vii
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
Fisher (1930)
i
ii
iii
iv
v
vi
vii
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
Fisher (1930)
i
ii
vi
vii
Equal contribution of parents
Equal payoff for parents
Best investment strategy
Convergence on even sex ratio
Fisher (1930)
iii
iv
v
Equal payoff for sexes
Higher success of rare sex ‘individuals’
Higher returns from rarer sex
i
ii
vi
vii
Equal contribution of parents
Equal payoff for parents
Best investment strategy
Convergence on even sex ratio
Fisher (1930)
iii
iv
v
Equal payoff for sexes
Higher success of rare sex ‘individuals’
Higher returns from rarer sex