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I'm a complete layman regarding biology, so I'm aware my question might be completely stupid. I understand that the genotypes within a species change in respons

• danieltillett 9y ago
  This is a very complex question and it depends on what traits you are looking at. A single nucleotide change at a single loci can cause a very significant change in phenotype. On top of this most evolutionary charge is not caused by new mutations sweeping through the population, but changes in the relatively frequency of different alleles (genes) in the population. Also what makes this a difficult question to answer is we don’t have a good idea what genes contribute to what human traits. We know that individual humans differ, and we know that a large amount of reason for this difference is genetic, what we don’t know is what genes are responsible for this difference. This is a long way of saying we know that the people living 100,000 years ago were genetically different to modern humans, but we don’t know how different and in which particular ways. Evidence points towards us being calmer in large groups (domestication), better able to digest agricultural foods, and better at abstract thinking.