In natural selection, what is the selective pressure?

What is the process in which humans breed organisms for desirable traits?

Natural selection results in change over time by acting on traits that are ___________.

When organisms move from one population to another, there is more genetic variation in the population because there are more alleles for a trait. This is known as ______________.

Natural selection is also known as _____________________.

Some individuals in a population have traits that make them better suited to the environment. These individuals are more likely to survive, to reproduce, and to pass down their genes to their offspring. This is process is ___________.

True or False: During snowy winters, owls with white feathers are better adapted to their environment than owls with brown feathers.

Darwin observed that Galapagos Island finches that lived on different islands had different beak shapes. What did Darwin hypothesis about the finches?

The struggle for existence against other individuals and species is ______________.

Which of the following does NOT affect the process of natural selection?

A __________ is a branching diagram that shows evolutionary relationships.

Select the reason why species may become extinct.

According to the diagram, which organism is the oldest species?

Organisms with a common ancestor often have ____________ structures that look similar but have different functions.

Which of the following is an example of a vestigial structure?

If two species have genes and proteins that have many similarities, what is probably TRUE?

Organisms that are better adapted to survive and reproduce in their specific environment have ___________ fitness.

Which of the following is a requirement of natural selection?

A comparison of amino acid sequences in hemoglobin reveals that humans and ______________ have the fewest amino acid differences.

A group of individuals of the same species that live together in a particular area is called a ______________.

What is the term for a physical or behavioral trait that allows an organism to better survive and to reproduce in its environment?

The solidified remain or imprint of once living organisms is called a ________________.

A mouse population that mostly forages for food at night has some mice with light gray fur and some mice with dark gray fur. In the next generation, more offspring will have what color of fur?

On a cladogram, species located near each other have closer evolutionary relationship.

True or False: Homologous structures are an important indication of a common ancestor.

True or False: Vestigial structures are important to an organism's survival.

Natural disasters, disease, or other events may kill a large number of individuals in a population. As such, there are fewer alleles in the population that offspring can inherit, so there is less variation. This is known as __________________.

Speciation may occur because of which event?

True or False: All mutations are harmful.

In ____________________, organisms that do not have a closely related common ancestor independently evolve traits that have a similar structure and/or function.

What happens in divergent evolution?

Cichlid fishes in lakes of the East African Rift. The lakes in this area are believed to support and sustain about 2,000 different species of these fish, each with different ecological and morphological characteristics such as body size. These lakes form a fragmented landscape that bio-geographically isolates the different species of cichlid fish from one another, allowing them, and many of the organisms they live with, to evolve separately.

The Rough-skinned newt produces a potent neurotoxin that concentrates in their skin. Garter snakes, have evolved resistance to this toxin through a series of genetic mutations, and prey upon the newts. The relationship between these animals has resulted in an evolutionary arms race that has driven toxin levels in the newt to extreme levels.

__________________ isolation occurs when two different species cannot produce viable offspring

What distinguishes zebras from from giraffes?

What number is the common ancestor of C and D

What is the common ancestor of Letters A, B, C, D, E?

_____________ selection occurs when one extreme trait is favored and that trait becomes frequent in the population.

_____________ selection occurs when the population has less variation and the average (most common) trait is favored.

_____________ selection occurs when two extreme traits are more favorable and genetic variation increases.

Organisms with ____________ structures have structures that look similar and have similar functions, but they do not share a recent common ancestor.

Organisms with ____________ structures have structures that once had an important function, but no longer have a purpose.

In adaptive radiation, one species rapidly evolves into many new species with different structures or forms to fill an ecological niche. This is an example of _________ evolution.