After a greater or lesser number of generations the mutants are eliminated. — G. Ledyard Stebbins Copy Share Image
No biologist has actually seen the origin by evolution of a major group of organisms. — G. Ledyard Stebbins Copy Share Image
After a greater or lesser number of generations the mutants are eliminated. — G. Ledyard Stebbins Copy Share Image
No biologist has actually seen the origin by evolution of a major group of organisms. — G. Ledyard Stebbins Copy Share Image
