Which of these outcomes are examples of reproductive isolation? Select all that apply.   Individuals of different species are physically compatible and can engage in sex   Hybrid individuals cannot produce offspring   Hybrid individuals or their offspring have similar fitness to the original species   Reproduction occurs at different times   Mating occurs but fertilization does not occur

If two organisms mate, then it is guaranteed that one of the offspring will be more fit than either of the parents  True  False

Which of these is an example of a key innovation?   A caterpillar of a butterfly species provides honey to an ant colony in order to receive protection and care.   A founding population of honeycreepers evolves beaks capable of cracking the seed of a tree species in their new habitat.   A new flower color morph arises in a plant population, but an associated pollinator does not distinguish flowers by color.   Co-occurring diploid species of wheat and goatgrass hybridize to form a viable tetraploid offspring that can no longer breed with its parents.

The behavior of chromosomes during meiosis and subsequent fertilization is responsible for most of the variation that arises in each generation. Which of these processes is included in that variation? 1. Metaphase chromosomal assortment in mitosis 2. Crossing over of replicated homologues from each parent in meiosis 3. Hybridization of random fertilization during cross breeding two species 4. Range expansion of populations 5. All of the above are true