A single mutation can have a large effect, but in many cases, evolutionary change is based on the accumulation of many mutations. I hope this help you
2. Random mutation, where a gene or set of genes in an individual organism is randomly different from the normal type of that gene in the larger population. This individual may gain an advantage from this mutation and its offspring will inherit the advantageous trait.
One way of creating a variation in a population is through genetic replication errors. This will make a new type of alleles. Environmental factors cause variation such as affecting enzyme activity and function. The changes would show in the phenotype of an organism.
Explanation: thus is one way ik for sure another way idk srry
meiosis is the first to occur after the nuclei of opposite of opposite mating types fuse
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