Evolution Review

In natural selection, the selective agent is the

• humans
• mutations
• breeders
• environment

a bird that can easily outcompete other birds for food and that can produce many eggs has a high

• life expectancy
• mutation rate
• fitness
• adaptability

which of the following is an example of a vestigial structure?

• the wings of a red-tailed hawk
• the hind limbs of a house cat
• the fins of sharks
• the wings of an ostrich

What is suggested by the similarity of early embryos of different species of vertebrates?

• no evolutionary relationships between the groups
• recent common ancestry
• similar environments in the past
• evolution froma distant common ancestor

Some organisms that share a common ancestor have features that have different functions, but similar structures.  These are known as

• vestigial structures
• analogous structures
• homologous structures
• fossil structures

If an organism has a vestigial structure, that structure likely once had a function in a(n)

• close relative
• early ancestor
• unrelated organism
• embryological stage

a measure of how commonly a particular allele occurs in a population is known as the 

• gene pool
• allele frequency
• mutation rate
• phenotype

Genetic variation can arise from a random change in the DNA of a gene.  The change is called a(n)

• mutation
• gene flow
• gene pool
• allele

What increases genetic variation when animals move  from one population to another

• genetic drift
• sexual selection
• bottleneck effect
• gene flow

What is speciation?

• combining of two species to form one with different traits
• isolation that affects mating behaviors
• timing of mating that prevents normal sexual selection
• divergence of two or more species from an existing one