Midterm Review part 2

Question 1

speciation

Answer 1

occurs when populations of the same species become genetically isolated

Question 2

Divergence

Answer 2

of species can be a consequence of natural selection, genetic drift, mutation and biased mating

Question 3

How do populations become genetically isolated from each other?

Answer 3

• different geographic areas
• they use different habitats within the same area
• if one population is polyploid and cannot breed with the other
• There is no universally agreed upon definition of species*

Question 4

Possible outcomes of species reproducing

Answer 4

• pre and post zygotic isolation
• development of hybrid zones
• speciation by hybridization
• fusion
• one population goes extinct

Question 5

Divergence occurs as a consequence of:

Answer 5

• natural selection
• genetic drift
• mutation
• biased mating

Question 6

Species

Answer 6

an evolutionarily independent population or group of populations

Question 7

Gene flow

Answer 7

homogenizes genetic variation among populations so evolutionary independence starts with lack of gene flow. When gene flow stops speciation begins to occur

Question 8

The biological species concept

Answer 8

assigns individuals to the same species if they actually or potentially interbreed. No gene flow!

Question 9

Prezygotic isolation

Answer 9

can’t interbreed