Biology Quote by Lynn Margulis
“Although random mutations influenced the course of evolution, their influence was mainly by loss, alteration, and refinement... Never, however, did that one mutation make a wing, a fruit, a woody stem, or a claw appear. Mutations, in summary, tend to induce sickness, death, or deficiencies. No evidence in the vast literature of heredity changes shows unambiguous evidence that random mutation itself, even with geographical isolation of populations, leads to speciation.”
About This Quote
Source Book: Symbiosis in Cell Evolution by Lynn Margulis, 1998
Evolutionary change is driven more by loss, alteration, and refinement of existing traits than by single beneficial mutations, which are rare and often harmful.
In simple terms: Evolution relies on modifying existing features, not sudden perfect mutations.
Key Takeaway
Focus on incremental improvements and loss of function.
Themes
evolution
biology
mutation
speciation
Mood
analytical
inquisitive
Type
scientific
educational
When to use this quote
- research studies
- comparative anatomy
- population genetics
- environmental change
Key Concepts
genetics
adaptation
loss of function
Questions to Reflect On
- How do losses contribute to new functions?
- What role does refinement play in adaptation?
A Different Perspective
Single mutations rarely create complex structures; many are deleterious.
![“Natural selection eliminates and maybe maintains, but it doesn't create... Neo-Darwinists say that new species emerge when mutations occur and modify an organism. I was taught over and over again that the accumulation of random mutations led to evolutionary change [which] led to new species. I…” quote by Lynn Margulis](https://sms4smile.com/quotes/img-quotes/5b9/lynn-margulis-17073_biology_natural-selection-eliminates-and-maybe-m_397958.jpg)
