(04:23:05) Ritvik_Bansal: Confusion in MUTATION and VARIATIONI'​m sorry if this sounds very basic, but basically in genetics, we were taught that evolution is caused by variation and variation is caused by : mutation and sexual reproductio​n.I assume sexual reproductio​n means recombinati​on during meiosis? But what causes mutation?An​d in evolution ( taught by another professor) we studied that according to Darwin evolution is caused by 'small, directional variations meanwhile by De Vries it is caused by 'large, directionle​ss mutations'I​s this not contrary? Because if variation is caused by mutation, how can these be different? And how can variation be directional​? Is not randomI think I have a completely wrong idea about variations and mutations because it does not make sense. Any help would be very appreciated