Tai lieu

Fossils provide evidence for evolution because they

• exist in all types of rocks

• show patterns of biological change

• supply good samples of RNA

• are millions of years old

Charles Darwin proposed his theory of evolution based on observations of nature. Which observation that contributed to his theory is illustrated by this population of beetles?

• Environmental resources are limited.

• Populations remain stable over time

• Individuals within a population show genetic variation

• Species produce more offspring than can survive

In the Galapagos Islands, there was an over-population of finches. Most of the finches ate only one type of food. Some of the finches, because of the competition within their population, began to eat other types of food. Which of the following adaptations would you expect to find among these finches who ate other food?

• Beaks with different shapes

• Longer feathers for better flight

• Hollow bones for better flight

What kind of information can be obtained from the fossil evidence shown in the above diagram?

• The cause of extinction of the organisms

• The absolute age of the fossil

• The relative age of the fossil

• The mating behaviors of the organisms

Genetic variations within a species are most likely the result of-

• overpopulation and recombination

• mutations and sexual reproduction

• mutations and asexual reproduction

• mitosis and overpopulation

A population of mice is evenly divided into two groups and put on separate isolated islands with no existing mouse population. Which statement best explains the difference in the mouse populations on Island A and Island B at the end of the 20 years?

• The recapturing of mice on Island A and Island B was done differently.

• On Island A, the allele for gray fur was dominant, while on Island B, the allele for brown fur was dominant

• More brown mice were in the half of the original population that was sent to Island B than in the group sent to Island A

• The environment on Island B favored the brown-furred individuals, while fur color was not a selective pressure on Island A

Snail kites fly over the water, looking for aquatic snails to eat. Snail Kite with Snall If a group of snails has a lighter coloration that makes them easier for snail kites to see, which outcome is most likely to occur over time? The number of lighter snails will

• stay about the same because snail kites eat all colors of snails

• stay about the same because they will learn to hide more effectively from the snail kites

• increase because the snail kites will not eat them since they look different

• decrease because the snail kites will be more likely to see and eat them

Bacteria adapt more quickly to environmental changes than elephants. Which best explains this difference?

• Bacterial populations are more isolated.

• Individual bacteria have more genes.

• Individual bacteria grow more steadily.

• Bacteria reproduce more rapidly.

An antibiotic is effective at killing 95% of bacteria that reproduce by the process shown below. Which statement best describes future generations of this bacteria?

• They will be produced sexually and be more resistant to the antibiotic

• They will be produced asexually and have the same resistance to the antibiotic

• They will be produced sexually and have the same resistance to the antibiotic

• They will be produced asexually and be more resistant to the antibiotic

The bones that make up the forelimbs of humans, cats, whales, and bats are similar, Which of the following statements best supports the evolutionary relationship between these animals?

• The animals have different ancestries but have adapted to similar environments

• The animals at one time lived in different environments but now share an environment

• The animals share common ancestry but have adapted to different environments

• The animals use their forelimbs for identical activities but live in different environments