Quiz 7: Evolution 4

When a species environment favors one dominant type of characteristic to the point that the other variations of the trait start to disappear is called _____.

• disruptive selection

• directional selection

• stabilizing selection

• unstabilizing selection

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All the genes in a population are the population’s

• Gene flow

• Gene pool

• Genotype

• Fitness

Which of the following is the best definition of species?

• A group of organisms that lives in the same habitat

• A group o organisms that exploit the same ecological niche

• A group of organisms that can interbreed and produce viable and fertile offspring

• A group of organisms that have the same appearance

Sparrows with average sized wings survive severe storms better than those with longer or shorter wings, illustrating

• Sexual selection

• Directional selection

• Disruptive selection

• Stabilizing selection

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Only a few types of a particular bird species diverge after a small number colonises a new island. This mechanism is called

• stabilizing selection

• directional selection

• the founder effect

• disruptive selection

According to this cladogram, sharks are MOST closely related to which organism? 

• Amphibians
• Ray finned fish
• Crocodiles
• Birds

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A population of a certain kind of fish is introduced into a new habitat. These fish have variations in color from light to dark. Because of the lighting conditions and predators in this new habitat, light colored fish survive better near the surface and dark-colored fish survive better near the bottom.
What change would likely result after many generations of these fish living in this environment?

• All the fish would become more similar, something exactly between light-colored and dark-colored.
• None of the fish would be able to survive, because the new habitat is not suited to any of them.
• There would be two populations of fish, light-colored near the surface and dark-colored near the bottom.
• The fish would become smaller over time so that they could more easily defend themselves from predators.

Whales, which live in the water, have hips. These structures are important for carrying the weight of animals that walk on land. Finding this body part in animals that don’t walk on land is best explained how?

• Whales have evolved this structure because it might be useful in the future.
• Whales are able to interbreed with other animals that have hips.
• Whales have a diet that includes other animals that have this structure.
• Whales share a common ancestor with animals that walk on land.

Both butterflies and bats have the ability to fly due to wing development. How would you describe the evolutionary relationship of the animal's wings?

• polytomy

• homoplasies

• analogous

• vestigial

Where is the T.rex and frog's common ancestor?

• Point A
• Point B
• Point C
• Point D

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