How is reproductive isolation related to the formation of new species?

Which plains area lies in both the united states and canada? altiplano central canadian shield coastal plains great plains

Red flowered snapdragons are crossed with white flowered snapdragons, producing all pink snapdragons in the f1 generation. what would you expect if you crossed pink with pink? 3/4, 1/4, 1/2 red, 3/4,/1/2,/1/4 pink,1/2, 3/4, 1/4 white

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.