Chapter 8 Heredity and Evolution
1) Variations arise during the process of reproduction. They may be few in asexual reproduction, but many in case of sexual reproduction.2) The minor variations arising during asexual reproduction are caused by slight inaccuracies in DNA copying. In sexual reproduction, variations are also caused by crossing over process of meiosis.
3) Beneficial variations help the species to survive better in the environment.
4) Nature selects the beneficial variations thereby leading to evolution.
5) Reproduction produces offsprings with similar body design of the parents. However the offspring are not identical, but show a great deal of variation from the parents.