Variation : differences amongst members of the same species. (E.g. hair colour/height)
Variation can be inherited (in genes) or acquired (learning over time E.g. ability to speak French)
Inherited Variation amongst species occurs by two mechanisms:
1)Sexual reproduction: produces variation due to meiosis (see Chapter 13: The Cell Cycle)
2) Mutation: produces variation due to changes in the amount or structure of DNA.
Result: change in sequence of bases - no protein produced. Can affect a somatic cell (anc could cause cancer) or a gamete (and be passed onto offspring)
Mutations can occur spontaneously – for... (More)