Question

Make the following argument: in species where cultural transmission is prevalent, we expect weaker natural selection on genetically transmitted traits. Now make the counter argument: in species where cultural transmission is prevalent, we expect stronger natural selection on genetically transmitted traits.

Answer 1

The cultural transmission may apply to traits acquired by any process of Non-genetic transmission whether by conditioning, observing, imitation or as a result of direct teaching.

Some finding suggest that vertical (parent-offspring) as opposed to Horizontal (peer) transmission serves the function of spreading more complex cultural units, and that horizontally transmitted traits are advantageous in rapidly changing spatially heterogenous environments.

Under Second condition, the organisms are better adapted to their environment, tend to survive and produce new offspring because they have an additional advantage of traits that they acquired through the life process, such advantages in long run will lead to stronger natural selection.

Answer 2

Argument and Counterargument on Cultural Transmission and Natural Selection

Initial Argument:

"Cultural transmission weakens natural selection on genetic traits."

• Reasoning:

• If knowledge/behavior is learned (culture) rather than innate (genes), genetic mutations affecting those traits become less critical for survival.

• Example: Humans use tools (cultural) instead of evolving stronger jaws (genetic), reducing selective pressure on jaw strength.

• Result: Genetic traits related to culturally replaceable functions face relaxed selection.

Counterargument:

"Cultural transmission strengthens natural selection on genetic traits."

• Reasoning:

• Culture creates new selective pressures (e.g., genes for brain plasticity favored to support learning).

• Example: Human language (cultural) selects for genetic improvements in cognitive processing and vocal anatomy.

• Result: Genes enabling cultural adoption (e.g., intelligence, social cognition) face stronger selection.

• 
  

Conclusion: Cultural transmission shifts (not uniformly weakens) selective pressures.