Natural selection UNIT TEST

adaptation

• an inherited or learned trait that increases an organism`s chance of survival in its environment

• a process by which organisms better adapted to their environment tend to survive, reproduce, increase in number, and pass on traits to succeeding generations

• a group of organisms of the same species that live in an area

• a group of organisms that breed and produce offspring that can breed

natural selection

• an inherited or learned trait that increases an organism`s chance of survival in its environment

• a process by which organisms better adapted to their environment tend to survive, reproduce, increase in number, and pass on traits to succeeding generations

• a group of organisms of the same species that live in an area

• a group of organisms that breed and produce offspring that can breed

population

• an inherited or learned trait that increases an organism`s chance of survival in its environment

• a process by which organisms better adapted to their environment tend to survive, reproduce, increase in number, and pass on traits to succeeding generations

• a group of organisms of the same species that live in an area

• a group of organisms that breed and produce offspring that can breed

species

• an inherited or learned trait that increases an organism`s chance of survival in its environment

• a process by which organisms better adapted to their environment tend to survive, reproduce, increase in number, and pass on traits to succeeding generations

• a group of organisms of the same species that live in an area

• a group of organisms that breed and produce offspring that can breed

Natural selection is a process by which organisms that are better adapted to their environment tend to

• increase in size.

• migrate.

• evolve new traits.

• survive.

In the African savanna, more wildebeests are born than the environment can support. Which is most likely to happen over a period of years as a result?

• The chances for survival of the population are reduced.

• New food sources are discovered and become the regular diet.

• Individuals that are well suited to the environment reproduce, and those that are not well suited die before they reproduce.

• The environment adapts by providing more resources to the growing population, increasing the chances of survival for individuals within the habitat.

What is natural selection?

• a process that selects variations that help with survival and that spreads the variations to more offspring

• a process through which nature selects an individual within a population for extinction

• a process that causes all populations to gradually increase in size

• a process that causes random variations to appear in the offspring of every generation

In terms of natural selection, what is the best description of an organism that is fit?

• The organism is physically stronger than competing organisms.

• The organism is physically stronger than organisms of a different species.

• The organism is better able to survive and pass on traits to offspring than competing organisms.

• The organism is a member of a population in which every member survives without competing.

During a trip to the Galapagos Islands, which observation led Charles Darwin to suspect that organisms change over time?

• Island finches were able to breed with mainland species.

• Island finches resembled mainland finches, but were not the same species.

• Island finches resembled extinct species from other islands around the world.

• Island finches did not have beaks of the same size and shape.

The map shows the allele frequency of sickled hemoglobin (HbS) and malaria endemicity in Africa.

Which statement best explains the relationship between HbS allele frequency and malaria endemicity in Africa?

• When an area is malaria free, the HbS allele frequency is between 0 and 4.04.

• When an area is holoendemic, the HbS allele frequency is between 0.52 and 4.04.

• When an area is malaria free, the HbS allele frequency is between 12.64 and 18.18.

• When an area is holoendemic, the HbS allele frequency is between 0 and 0.51.