Answer |
: Because of a single mutation in adevelopmental gene, two closely related species of wasps have aslightly different anatomy of their sex organs making interbreedingimpossible. |
: Two species of snakes aremorphologically very similar but breed during differentseasons. |
: Two similar species of treehopperslive and feed on two separate species of trees. |
: Males of two species of birds usedifferent mating dances to attract their mates. |
: Due to a geographic barrier, asmall portion of a population remains isolated and its gene pooldiverges from that of the original population. |
: Sperm from a male of one speciesdies in the reproductive tract of the female of a different speciesbefore fertilization can occur |
: Mules are a cross between a donkeyand a horse; they are viable, healthy animals, but they cannotreproduce. |
: A cross between two species ofsalamanders yields offspring, but they do not survive long enoughto reproduce |