Mutations - A driving force of evolution
Mutations give rise to new alleles; therefore, they are the source of variation in a population.
Variation from mutations: Mutations, a driving force of evolution, is a random change in a population's gene pool. It is a change in the nature of the DNA in one or more chromosomes. Mutations give rise to new alleles; therefore, they are the source of variation in a population. Mutations may be harmful, but they may also be beneficial. For example, a mutation may permit organisms in a population to produce enzymes that will allow them to use certain food materials. Over time, this type of individuals survive, while those not having the mutations perish. Therefore, natural selection tends to remove the less–fit individuals, allowing more–fit individuals to survive and form a population of fit individuals. Genetic misspellings are thus the engine that drives evolution itself.
Variations from genetic recombination: Meiosis produces genetic variation by the way of the process of recombination, thereby creating offspring with unique combinations of DNA. This constant mixing of parental DNA in sexual reproduction helps fuel the incredible diversity of life on Earth. Genetic recombination allows trillions of different combinations of DNA. This plays a significant role in adaptations to different environments. For example, if we all had the same DNA, we would all be susceptible to the same diseases. A single disease could destroy the entire population. By providing for different combinations of DNA, there is a greater chance that the race will be able to adapt to certain conditions.
Thus, diversity makes life interesting. For example; if every house on the block looked the same, if every restaurant served the same food, if everyone talked at us for hours in a monotone about things we already knew, then life just wouldn't have much aliveness, would it? Diversity is a fundamental property of the universe, along with matter, energy, space, time, relationship, unity, and many other phenomena that are present everywhere. Everything that you see (or don't see) that is different from anything else — and every difference between them — is an aspect of diversity. So diversity exists everywhere. Diversity is the one true thing we all have in common. Celebrate it every day!