Exam 14: The Origin of Species

Two species that occasionally mate and produce zygotes, but that have incompatible genes that prevent the resulting embryo from developing, are affected by

Uplift and formation of a mountain range divide a freshwater snail species into two isolated populations. Erosion eventually lowers the mountain range and brings the two populations together again, but when they mate, the resulting hybrids all produce sterile young. This scenario is an example of

Organisms that possess more than two complete sets of chromosomes are said to be

Which butterfly has changed gradually but significantly from its ancestor through microevolutionary events that were not part of a speciation event?

Allopatric speciation is not likely to occur when

Under the biological species concept, a species is a group of organisms that

A group of ants escaped from a picnic basket carried to the top of a mountain and thrived in this area where there were no other ants. Many years later descendants of these ants crawled into a picnic basket on the mountain and traveled back to the valley from which their ancestors had come. Which of these observations would cause you to conclude that the ants on top of the mountain had become a different species from those in the valley?

In the chiclid populations in Lake Victoria, what trait in females acted as a selection factor on which males they mated with?

When a tetraploid flower pollinates a diploid flower of the parental species, the resulting offspring will be

The Monterey pine and the Bishop's pine inhabit some of the same areas of central California. The Monterey pine releases pollen in February, while the Bishop's pine does so in April. This is an example of ________ isolation.

Diane Dodd's experiments using fruit flies demonstrated that

Which of the following types of reproductive barriers separates a pair of species that could interbreed but for the fact that one mates at dusk and the other at dawn?

Which of the following types of reproductive barriers separates two flowering plant species that could interbreed but for the fact that one has a deep flower tube and is pollinated by bumblebees whereas the other has a short, narrow flower tube and is pollinated by honeybees?

Which of the following descriptions best represents the gradual model of speciation?

Which of the following would tend to promote adaptive radiation?

If H. floresiensis were reunited with H. erectus at a much later date but the two populations could no longer interbreed, it would be correct to conclude that

The data in this graph indicate

Which of the following would a biologist describe as microevolution?

One of the finest available sequences of fossils shows how horses have changed slowly and by subtle steps from small, shrub-browsing ancestors to the large, grass-grazing modern horse. A large number of fossil species have been named, and it is often difficult to decide on the identity of a fossil horse because transitional forms are common. This record of evolution best fits the idea of

A new plant species may arise in a single generation by