9. The Species Concept and Speciation

Question 1

What is the definition of species?

Answer 1

group of organisms which are capable of reproducing with each other sexually

Question 2

What are the two types of reproductive isolation?

Answer 2

prezygotic and postzygotic

Question 3

What is prezygotic reproductive isolation?

Answer 3

prevents the formation of a hybrid zygote

Question 4

What is postzygotic reproductive isolation?

Answer 4

prevents the development, survival, or reproduction of hybrid individuals

Question 5

What are the barriers to prezygotic reproductive isolation?

Answer 5

ecological
temporal
behavioral
mechanical
gametic

Question 6

What are the barriers to postzygotic reproductive isolation?

Answer 6

hyrbid inviability
hybrid sterility
hybrid breakdown

Question 7

What is the definition of speciation?

Answer 7

creation of a new species

Question 8

What are homologous structures?

Answer 8

physical features shared by two different species as a result of a common ancestor

Question 9

What are analogous structures?

Answer 9

physical features that serve the same function in two different species but not due to common ancestry

Question 10

What is convergent evolution?

Answer 10

when two different species come to possess many analogous structures due to similar selective pressures

Question 11

What is divergent evolution?

Answer 11

divergent selection that causes cladogenesis

Question 12

What is parallel evolution?

Answer 12

situation in which two species go through similar evolutionary changes due to similar selective pressure