Culture & control of human evolution. Biological evolutionCultural evolution Relative rates of evolution.

Culture & control of human evolution

Biological evolution Cultural evolution

Relative rates of evolution

Cultural transmission in Japanese macaques

-potato washing

-grain sorting

Tool use in chimpanzees

Sociobiology

EO Wilson

Sociobiology: the systematic study of the biological bases of social behaviorie. using evolutionary theory as a foundation for the study of social behavior

Sociobiology

Application of sociobiology to mate choice

Male mating decisionspredict:-competitive & aggressive, promiscuous, less nurturing to children, attracted to fertile females

Female mating decisionspredict:-less competitive, more nurturing to children, attracted to resource-rich males

Social Darwinism

Herbert Spencer

Social Darwinism: social & cultural differences in human societies arise through processes of natural selection, similar to those that account for biological differences among populations & species

Social Darwinism

JD Rockefeller

Appealing to those in ‘superior’ social positions

Assumes society operates through same laws as biology

False assumption!

No evidence that what is in biology, is or ought to be in society

Eugenics

Eugenics: humanity can be improved by altering human genotypes or their frequenciesie. evolution of human traits by natural selection could be substituted by evolution through social selection

Positive eugenics - increase frequency of beneficial genes

Negative eugenics - decrease frequency of deleterious genes

Eugenics

Positive eugenics - increase frequency of beneficial genes

Sperm banks

Genetic engineering

Parthenogenesis

Cloning

Eugenics

Negative eugenics - decrease frequency of deleterious genes

2 - 2.5% of children born in the US are markedly defective - mentally or physically

Two reasons for prevalence of deleterious genes

1 although deleterious in homozygous condition, may produce hybrid vigor in heterozygous

2 frequency of deleterious genes is now high because natural selection has been artificially reduced

Biological vs cultural maturity

Biological efficiency decreases post-reproductive age of 20-30

Cultural efficiency increases then or later

Cro-Magnon man

Human population projected to reach 12 billion by 2050

Humans evolve, but also know that they evolve

-what is the goal?

-can we choose the direction of human evolution with certainty that this direction is what is best for our descendents?

Humans are graduating from being mere subjects of evolution to coauthors

We have the destiny of ourselves and many other organisms in our hands

Obligatory Darwin quote

There is grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one; and that, … from so simple a beginning endless forms most beautiful and most wonderful have been, and are being, evolved.

Darwin 1859