Biologically Costly Altruism Depends on Emotional Closeness among Step but Not Half or Full Sibling
We studied altruistic behaviors of varying biological cost (high, medium, and low) among siblings of varying genetic relatedness (full, half, and step). In agreement with inclusive fitness theory, the relative importance of either reliable (such as co-residence) or heuristic (such as emotional close...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SAGE Publishing
2009-01-01
|
| Series: | Evolutionary Psychology |
| Online Access: | https://doi.org/10.1177/147470490900700116 |