Exam 11: Evidence for Evolution

The E.coli populations that survived the selective pressure of growing at the warmer temperatures did so because of ________ present in their DNA.

Two fossils of the same species are found in both Africa and South America.What does this indicate?

The preserved remains of formerly living organisms are called ________.

A group of scientists proposed that mammals with fur that contrasts with their background are hunted more by predators than mammals with fur that blends in with their background.After running several experiments,the scientists found that dark mice were attacked 25 percent of the time in a dark habitat and 75 percent of the time in a light habitat.The light-colored mice were attacked 25 percent of the time in a light habitat and 75 percent of the time in a dark habitat.These data

Placing a human gene into a plant produces the same protein as would be produced in a human.Some of the genes in plants are similar to human genes; others are very different.What does this information indicate about the relationship between humans and plants?

The result of ________ over evolutionary time spans is that alleles that allow organisms to survive and reproduce at a higher rate than other individuals become more common in the population.

By 200 million years ago,parts of the supercontinent of Pangaea had begun to drift away from each other.Laurasia (North America and Eurasia)separated from Gondwanaland (South America,Africa,Antarctica,Australia,and India).Which of the following would you expect to find?

Evaluate the DNA sequences presented below to determine which of the organisms (B,C,or D)shares the most closely related ancestor to organism A.Which organism shares the least closely related ancestor to A? Support your answer with DNA sequence similarity evidence from the figure that represents the DNA sequence for a single protein found in all four organisms.

The genus Lycopodium includes plants that evolved before the breakup of Pangaea.The genus Sequoiadendron (Sequoia trees)evolved after Pangaea split into separate landmasses.Which genus would you expect to have the widest distribution of living representatives across the modern continents?

Human embryos have webbing between their fingers and toes,but genes turn on during development that cause this webbing to dissolve before birth.Tiktaalik and other early amphibians had lobed fins or limbs.This evidence supports the hypothesis that humans and amphibians had a ________ in fish.

Fish typically have eyes on the sides of their heads.The embryos of amphibians,birds,and mammals begin with their eyes on the sides of their heads,but the eyes move toward the center of the head during development.What does this suggest about the common ancestor of these diverse animals? Provide additional supporting evidence from your reading.

Fossils of organisms that lived on Pangaea are likely found

Humans simulate the process of natural selection when they use ________ to develop new varieties of crop plants that better meet the needs of farmers.

Natural selection tends to

Equus (horses)have a single toe on their hoof,while Hyracotherium (the ancestor to horses)had four toes.Which of the following evidence would support this conclusion?

Grasshopper mice prey on venomous scorpions.Though the mice have some level of resistance to the scorpion venom,scorpions with more potent venom are better able to fend off attack by a grasshopper mouse.Over time,the population of scorpions all produce more potent venom.This is an example of ________ selection.

Why do human embryos develop gill slits?

Examine the figure below.According to this figure,which two breeds have the LEAST similar DNA?

The fossils of organisms that existed when the continents were connected are distributed across ________ continents than the fossils of organisms that evolved after the continents separated.

Although they are protected in many countries,humans still hunt elephants for their ivory tusks.A mutation that results in tuskless elephants is increasing in frequency in some elephant populations.Is this an example of artificial or natural selection? Support your answer.