More or less the same as you just did? i.e. these were independent branches just like chimps and humans.
Albeit there was some mixing even in the areas settled by Anatolian farmers. According to current estimates the WHG population was very low to begin with and they continued living alongside farmers for quite a while (due to both groups preferring different environments/soil types) so it probably was more gradual rather than direct replacement/genocide.
Albeit there was some mixing even in the areas settled by Anatolian farmers. According to current estimates the WHG population was very low to begin with and they continued living alongside farmers for quite a while (due to both groups preferring different environments/soil types) so it probably was more gradual rather than direct replacement/genocide.