* Inheritance: Mutations in body cells (somatic mutations) are not passed down to offspring. They affect only the individual organism.
* Germline Mutations: Mutations in egg cells (germline mutations) are passed down to every cell of the offspring, including the germline cells that produce future eggs and sperm. This means the mutation can be transmitted to future generations.
Evolutionary Impact:
* Body cell mutations: These can cause diseases or changes in the individual, but they don't change the genetic makeup of the population as a whole.
* Egg cell mutations: These introduce new genetic variations into the gene pool, which is the foundation of evolution. Over time, these variations can be acted upon by natural selection, leading to changes in the population's traits.
Example:
Imagine a mutation in a gene that affects fur color.
* Body cell mutation: A mutation in a skin cell might cause a patch of white fur on an otherwise brown animal. This won't be passed on to its offspring.
* Egg cell mutation: A mutation in an egg cell could cause the offspring to be born with white fur. This offspring could then pass this trait to its own offspring, potentially leading to a shift in the population's fur color over generations.
In short: Mutations in egg cells have a much greater impact on evolution because they can introduce new genetic variations that can be passed down to future generations and influence the overall genetic makeup of a population.
