This sort of evolution which is influenced by choices that individuals make concerning which individual to mate with or even which offspring to pay more attention to is considered behavioural isolation, where an individual isolates himself or herself from other individuals he/she does not fancy.
The more specific term for the former is sexual isolation.
there are 12 marbles. the probability of getting a yellow would be 2/12, the probability of drawing a red is 4/12, and the probability of getting a black is 3/12. (i think,, dont quote me if im wrong!)
Explained by natural selection. Those with favored traits in an environment are more likely to survive and pass down the allele. Thus in this situation a grey rabbit is more likely to survive and blend in.
