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In fact, we expect that across all humans, there are over 100 mutations at every single position in the human genome. And, here is the math to prove it: The average mutation rate in the human genome is 1.2 x10^-8 mutations per site per generation.This is pretty small, so in each person, we only expect to observe a handful of new mutations relative to their parents.But, that handful of mutations adds up when you think of how many people are on the earth.n fact, we expect that across all humans, there are over 100 mutations at every single position in the human genome. And, here is the math to prove it: The average mutation rate in the human genome is 1.2 x10^-8 mutations per site per generation.
What is a gene mutation and how do mutations occur? A gene mutation is a permanent change in the DNA sequence that makes up a gene. Mutations range in size from a single DNA building block (DNA base) to a large segment of a chromosome. Gene mutations occur in two ways: they can be inherited from a parent or acquired during a personâs lifetime. Mutations that are passed from parent to child are called hereditary mutations or germline mutations (because they are present in the egg and sperm cells, which are also called germ cells).