define. i.natural selection ii.genetic drift evolution

Asked by Gayatri Narkhede | 8th Feb, 2014, 09:03: PM

Expert Answer:

(i) The process whereby organisms better adapted to their environment tend to survive and produce more offspring is called natural selection.
(ii) The process of change in the genetic composition of a population due to chance or random events rather than by natural selection, resulting in changes in allele frequencies over time is called genetic drift.
(iii) Organic evolution is the scientific process of identifying a genetic change in a species or within a group of species over an amount of time.

Answered by  | 10th Feb, 2014, 08:33: AM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.