Problem : What is the difference between geographical isolation by vicariance and by dispersal?
Problem : A farmer plants two crops of the same plant three weeks apart. The first crop each crop flowers for about a week, approximately four weeks after planting. What type of reproductive isolation would you expect to find between these two populations?
Problem : The male of a given species of frog uses distinctive calls to attract mates. Two populations of these frogs coexist in a single pond but never interbreed because their mating calls are different. Females of one population will not respond to the calls of a male of the other populations. What type of reproductive isolation is this?
Problem : Describe gametic isolation.