Exam 22: Speciation

Two different species are crossed and the second generation (F₂) illustrates reduced fitness. This is an example of ____.

Eggs have receptors that recognize surface proteins on sperm of their own species. This illustrates ____.

Which scenario is NOT an example of a prezygotic isolating mechanism?

Allopatric speciation typically occurs in two stages. The first stage is ____ of two populations and the second stage is ____.

A species cluster is defined as a group of ____.

Research comparing chromosomal structure between the genomes of humans and other primates reveals that humans are most closely related to ____.

If two species of lizards do not mate because their mating rituals differ greatly, they are exhibiting ____ reproductive isolation.

In what way is clinal variation exhibited in animals?

Genomic analyzes of the apple- and hawthorn-feeding races of Rhagoletis suggest that genetic divergence between the two species has largely been driven by ____ selection, a diversifying form of natural selection.

Because ____ is less likely to occur between distant populations of the same species, their gene pools and phenotypes are often somewhat different.

A small population isolated at the edge of a species' geographic distribution may experience ____ and genetic drift, which may lead to the evolution of distinctive traits by ____.

Allopolyploidy is defined as ____ chromosome number due to ____.

How did researchers establish the connection between chimpanzees and humans?

When an error of meiosis results in a diploid gamete, the gamete is said to be ____, which can result in ____.

Bread wheat (2 n =42), which is a staple food for about a third of the world's population, evolved from two wheat-like ancestors (both 2 n =14); therefore, bread wheat is a ____ organism.

The uplift of the Isthmus of Panama, a geological event that occurred about five million years ago, separated populations of marine organisms and led to ____.

A zebroid is the sterile hybrid offspring of a horse and a zebra. This is an example of ____.

Paleobiologists apply the ____ species concept to identify fossilized remains.

To distinguish two organisms using the morphological species concept, a scientist would ____.