Evolution of Cooperation and Altruism in Animal Groups: Genetics and Kin Selection

What is the relationship between group living and cooperation?

Cooperation and altruism often emerge when individuals are already living in groups.

What is altruism in the context of animal behavior?

Altruism is when an animal performs a behavior that benefits another at a fitness cost to itself.

What is the role of reciprocity in the evolution of cooperation?

Reciprocity allows cooperative social relationships to evolve if costly behaviors are exchanged between partners.

What is kin selection?

Kin selection is a form of natural selection that favors behaviors that increase the reproductive success of genetic relatives.

What is the significance of genetic relatedness (r) in altruism?

Genetic relatedness (r) indicates the fraction of genes shared between individuals, influencing altruistic behavior.

What is the genetic relatedness (r) between full siblings?

The genetic relatedness (r) between full siblings is 0.5.

What is the genetic relatedness (r) between half siblings?

The genetic relatedness (r) between half siblings is 0.25.

How does meiosis affect genetic relatedness?

During meiosis, chromosomes split to form haploid gametes, resulting in a 50% probability of passing on genes.

What is the expected genome sharing between daughter cells at the end of meiosis I?

Approximately 50% of the genome is shared between the cell at the top and one of the daughter cells at the end of meiosis I.

What is the expected genome sharing between two gametes from different daughter cells at the end of meiosis II?

Approximately 50% if they came from different daughter cells.

What is the expected genome sharing between two gametes from the same daughter cell at the end of meiosis II?

Approximately 100% if they came from the same daughter cell.

What is an example of altruistic behavior in honey bees?

Altruistic defense in honey bees is an example of altruistic behavior.

What is an example of food-sharing altruism?

Food sharing in vampire bats is an example of altruistic behavior.

What does the term 'cooperation' refer to in social interactions?

Cooperation refers to social interactions where both parties benefit.

What are the potential costs of group living?

Group living can incur disease costs and competition among group members for resources.

How does altruism challenge traditional views of natural selection?

Altruism challenges the view that natural selection produces traits for the good of the individual rather than the species.

What is the genetic relatedness (r) between parents and offspring?

The genetic relatedness (r) between parents and offspring is always 0.5.

How do siblings share genetic material through their parents?

Siblings share approximately 25% of their genes through each parent.

What is the significance of the term 'fitness cost' in altruism?

A fitness cost refers to the decrease in an individual's reproductive success due to altruistic behavior.

What is the role of social interactions in the evolution of altruism?

Social interactions vary by who benefits and who pays a cost, influencing the evolution of altruism.

What is the genetic relatedness (r) between Charles Darwin and Emma Wedgewood Darwin?

The genetic relatedness (r) between Charles Darwin and Emma Wedgewood Darwin is 0.125, as they are first cousins.