Chapter 24

Question 1

What is a subspecies?

Answer 1

Groups of the same species that have different traits

Question 2

Ecotypes

Answer 2

Bacterial species that are adapted to a local environment

Question 3

What are the 5 characteristics of species?

Answer 3

1) morphological traits
2) interbreeding
3) molecular features
4) ecological features
5) evolutionary relationships

Question 4

Reproductive isolation

Answer 4

Mechanisms that prevent mating btwn 2 different species

Question 5

Interspecies hybrid

Answer 5

When 2 different species are able to make an offspring

Question 6

What are the 2 types of reproductive isolation?

Answer 6

1) prezygotic
2) postzygotic

Question 7

What are the 5 subunits for prezygotic isolation? And what do they do?

Answer 7

1) Habitat- different habitats “geographic barrier”
2) temporal- different time of day
3) behavioral- different behaviors
4) mechanical- different body parts
5) gametic- gametes are not compatible

Question 8

Same thing for postzygotic isolation?

Answer 8

1) hybrid inviability- egg of 1 species is fertilized by another species

2) hybrid sterility- hybrid survives but can’t mate (mule)

3) hybrid breakdown- 1st generation is viable but on going generations won’t have good fitness

Question 9

Speciation

Answer 9

Forming new species; occur during abrupt events (changes in chromosome #)

Question 10

What are the 2 types of speciation? Define them

Answer 10

1) Cladogenesis- division of 2 or more species; gene flow; interrupted

2) allopatric speciation- method of cladogenesis; become geographically separate

Question 11

Hybrid zones

Answer 11

Zones where 2 populations can mate; geographic separation is not complete

Question 12

Sympatric speciation

Answer 12

Members of a species that are within the same range into 2 or more different species