Barriers to Reproduction

Question 1

What are the 2 types of barriers to reproduction?

Answer 1

Prezygotic and Postzygotic

Question 2

Define Prezygotic Reproductive Barriers

Answer 2

Barriers that prevent mating or fertilization

Question 3

Define Postzygotic Reproductive Barriers

Answer 3

Barriers that prevent development of fertile adults

Question 4

What the the 5 Prezygotic Reproductive Barriers?

Answer 4

1. Habitat isolation
2. Temporal isolation
3. Behavioural isolation
4. Mechanical isolation
5. Gamete isolation

Question 5

What is habitat isolation?

Answer 5

Species may have different habitats so they do not come in contact with one another

Question 6

What is temporal isolation?

Answer 6

Species have different mating or flowering seasons or times of day. They may become sexually mature at a different time of year. This may prevent other species from mating with each other.

Question 7

What is behavioural isolation?

Answer 7

There is little to no sexual attraction between males and females of different species due to behaviour or physiology.

Question 8

What is mechanical isolation?

Answer 8

Structural differences in genitalia or flowers prevent copulation or pollen transfer between 2 species.

Question 9

What is gamete isolation?

Answer 9

Male and female gametes die before uniting or just fail to unite.

Question 10

What are the 3 Postzygotic Reproductive Barriers?

Answer 10

1. Hybrid inviability
2. Hybrid Sterility
3. Hybrid Breakdown

Question 11

What is hybrid Inviability?

Answer 11

Hybrid zygotes fail to develop or reach sexual maturity

Question 12

What is hybrid sterility?

Answer 12

Hybrid fails to produce functional gametes

Question 13

What is hybrid breakdown?

Answer 13

Offspring of hybrid are weak or infertile