Final answer:
Darwin and the neo-Darwinists had different views on inheritance, with Darwin emphasizing the inheritance of characteristics from parent to offspring while the neo-Darwinists focused more on genes.
Step-by-step explanation:
One of the main differences between Darwin and the neo-Darwinists is the way they interpreted the concept of inheritance. Darwin believed that characteristics are inherited and passed from parent to offspring, while the neo-Darwinists put more emphasis on genes as the carriers of inheritance. For example, Darwin did not agree with Lamarck's idea that traits acquired during an organism's lifetime could be passed on to the next generation.