Exam 3: Natural Selection, Speciation, and Extinction

Many young sea turtle hatchlings are eaten by birds on their way from the nest to the ocean. As a result, the young of some species tend to hatch synchronously, on or near the same date. This is an example of

In areas where malaria frequency is low, the sickle cell homozygote has lower fitness than a homozygote with two copies of the normal $\beta$ -globin allele.

Polyploidy is a common sympatric speciation mechanism in plants.

Pangaea split up into a Southern continent called Laurasia and a Northern continent called Gondwanaland.

In the phylogenetic species concept, molecular features of individuals, such as DNA sequences, may be used to distinguish species.

Stabilizing selection favors:

In an area only 20 x 5 miles on Hawaii, 26 subspecies of land snail, Achatinella mustelina, have been recognized, each in a different valley separated from the others by mountain ridges. This supports the idea of

In Africa, the equivalent species to the South American giant armadillo is the

Taxa with resistant life history stages may be able to survive temperature changes. During a period of rapid global cooling, following a meteor strike and a dust cloud, which taxa may be less resistant to extinction?

Some introduced species threaten native species with extinction through hybridization.

The northern and southern leopard frogs are morphologically similar yet reproductively isolated species.

The change in color of peppered moths in polluted areas is an example of which pattern of natural selection?

The Earth's Atmosphere contained little to no oxygen until about:

An example of stabilizing selection involves:

The Devonian is sometimes know as the "age of the _________".

The extensive forests of the carboniferous period gave rise to

In the recent past nearly all extinctions have been caused by:

During the _________ period, the continents had aggregated into one land mass called Pangea.

When green forms of the pea aphid suffer a higher rate of parasitism than red morphs, but red morphs are more likely to be attacked by predatory ladybird beetles, the result is:

Directional selection is exhibited by: