A major advantage of sexual reproduction is the increased genetic diversity that it creates. This originates from novel genetic combinations that result from meiosis and the fusing of the gametes thus produced: specifically the crossover events during meiosis and the bringing together of chromosomes from the parent pollen and ovule. This genetic diversity may increase the fitness of the plant in numerous ways. One way this could occur is through the development of traits that enable it to better survive and reproduce in its current location, for instance, through increased drought tolerance in a dry climate. Alternatively, the new traits may enable the offspring to colonise and reproduce in new areas, enabling the plant to spread. Another advantage is the large number of seeds that are often produced by sexually producing plants. This increases the chance that some of a plant's offspring will survive and reproduce in turn.