Unit 3B Review B (Mechanisms)

What is evolution?

• A measure of the relative survival and reproductive success of an individual
• A cumulative change in the genetically controlled characteristics of a population
• A physical change during an organism’s life that is inherited by its offspring
• A random change in the proportions of alleles from generation to generation 

Evolution is a change in _________ over time.

• populations
• individuals
• ecosystems
• communities

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

• natural selection
• inheritance
• artificial selection
• descent withOUT modification

In natural selection, the selective agent is the

• humans
• mutations
• breeders
• environment

How does natural selection lead to evolution?

• Environmental changes favor weaker members of the species
• Helpful variations accumulate among surviving members of the species.
• Overproduction provides food for stronger members of the species.
• Stronger offspring kill weaker members of the species

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

• heritable
• new
• mutated 
• better than the best

Differences between members of the same species are called

• predators
• traits
• selections
• variations

Variations within a population come from

• errors during DNA replication

• errors during cell division

• random mutations

• All of the Above

Mutations are important because they bring about

• death of the organism in which they develop

• genetic variation needed for a population to evolve

• benefits for the individual, not for the population

• change during an individual's life

What is the term for a feature that allows an organism to survive better in its environment?

• variation

• adaptation

• competition

• fitness