Biology - Unit 3.3: Mechanisms of Evolution

Which of the following is true?

• Gene pool frequencies do not change as a result of migration in or out of a population.
• Gene flow occurs only as a result of isolation of a small population.
• Gene flow can cause new alleles to enter a population's gene pool.
• Gene flow is due the the selection of the most favorable traits.

A change in a gene, group of genes or chromosome that results in a change in the proteins

• Replication

• Mutations

• Translation

• Transcription

Mutations are SOMETIMES helpful to the organism.

• true

• false

The combined genetic information of all memebers of a particular population forms a:

• gene pool

• allele frequency

• phenotype

• population

The formation of new species

• Speciation

• Evolution

• Natural selection

• Mutations

A population is

• a group of similar species in different areas

• a group of the same species in the same geographic area.

• a group of several species in the same geographic area

• a group of several species along with their abiotic factors in a small area.

A flash flood carried a raft of Amazon ants away from their original population. There is enough distance between the two groups, that they will never meet in nature again. What type of reproductive barrier is this?

• behavioral isolation
• temporal isolation 
• gametic isolation
• geographic isolation 

What is the main difference between a post-zygotic barrier and a pre-zygotic barrier?

• all Post-zygotic barriers lead to Allopatric speciation

• all Pre-zygotic barriers lead to Sympatric speciation

• Fertilization of egg and sperm have occured with post-zygotic barriers

• Fertilization of egg and sperm have occured in pre-zygotic barriers

Ants are the correct size and weight needed to open the flowers for the peony plant. The peony plant provides food for the ant and the ant fertilizes the peony’s flowers

• Convergent

• Divergent

• Coevolution

The Galápagos tortoises share a common ancestor, but have necks of different lengths to best reach the food they need in their environment.

• Convergent

• Divergent

• Coevolution