Bio 112 Ch. 24: The Origin of Species

Question 1

What is a species? (4 major topics)

Answer 1

1. Morphology 2. Physiology 3. Biochemistry 4. DNA sequences –>all considered when grouping animals together

Question 2

________ between populations holds the phenotype of a population together.

Answer 2

Gene Flow.

Question 3

___________ is the existence of biological factors (barriers) that impede two species from producing viable, fertile offspring.

Answer 3

Reproductive Isolation.

Question 4

Prezygotic Barriers (5):

Answer 4

1. Habitat Isolation2. Temporal Isolation 3. Behavioral Isolation 4. Mechanical Isolation 5. Gametic Isolation

Question 5

Postzygotic Barriers (3):

Answer 5

1. Reduced Hybrid Viability 2. Reduced Hybrid Fertility 3. Hybrid Breakdown