5 Written questions
5 Matching questions
- postzygotic barrier
- morphological species concept
- reproductive isolation
- a In evolutionary biology, a process in which natural selection strengthens prezygotic barriers to reproduction, thus reducing the chances of hybrid formation. Such a process is likely to occur only if hybrid offspring are less fit than members of the parent species.
- b A reproductive barrier that prevents hybrid zygotes produced by two different species from developing into viable, fertile adults.
- c The existence of biological factors (barriers) that impede members of two species from producing viable, fertile offspring.
- d A definition of species in terms of measurable anatomical criteria.
- e Evolutionary change below the species level; change in the allele frequencies in a population over generations.
5 Multiple choice questions
- The formation of new species in populations that are geographically isolated from one another.
- A population or group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring, but do not produce viable, fertile offspring with members of other such groups.
- In the fossil record, long periods of apparent stasis, in which a species undergoes little or no morphological change, interrupted by relatively brief periods of sudden change.
- An individual that has more than two chromosome sets that are all derived from a single species.
- A reproductive barrier that impedes mating between species or hinders fertilization if interspecific mating is attempted.
5 True/False questions
sympatric speciation → The formation of new species in populations that live in the same geographic area.
polyploidy → A chromosomal alteration in which the organism possesses more than two complete chromosome sets. It is the result of an accident of cell division.
hybrid zone → A geographic region in which members of different species meet and mate, producing at least some offspring of mixed ancestry.
macroevolution → Evolutionary change above the species level. Examples of this type of change include the origin of a new group of organisms through a series of speciation events and the impact of mass extinctions on the diversity of life and its subsequent recovery.
hybrid → A geographic region in which members of different species meet and mate, producing at least some offspring of mixed ancestry.