Unformatted text preview: had not published his work, out of fear of retribution. • Can you explain Darwin's three postulates: there is a struggle for existence; there are variations in fitness within all species; and traits are heritable? 1. There is a struggle for existence - Scientists before Darwin thought that competition or "struggle for life" might be the reason for the survival or extinction of species. Darwin felt that such a struggle might also occur between the members of a species, determining which individuals survived and reproduced and which did not. 2. There are variations in fitness within all species - Some species are better adapted for certain environments. Fitness (the ability to adapt) helps determine what species will continue or go extinct 3. Traits are heritable - certain traits can be passed to other members of the same species he just didn't understand how this worked because he had not heard of Mendel's work at the time....
View Full Document
This note was uploaded on 11/18/2011 for the course ANTHROPOLO an 101 taught by Professor - during the Fall '09 term at Montgomery.
- Fall '09