Which of the following is an example of a prefertilization barrier to reproduction?
a. A female mammal is unable to carry a hybrid offspring to term;
b. Hybrid plants produce only sterile pollen;
c. A hybrid between two bird species cannot perform a mating display;
d. A male fly of one species performs a 'wing-waving' display that does not convince a female of another species to mate with him;
e. A hybrid embryo is not able to complete development

Question

Accepted Answer

Hello everyone. And in today's video we have the following problem. So the pre fertilization barriers to reproduction do not include. Remember that we're looking for the not statement in our answer chases. So since we're looking for pre since we're looking at pre fertilization barriers, remember that we are going to be canceling these out because we're looking for the not statement. And we will be looking mostly at post fertilization barriers as our answer choices. So keep in mind while we go over. This is what we're going to mostly be focusing on. So now let's go over answer choices beginning by answer choice. It's going to be the failure of the pollen tube to reach the ovaries. Well, the role of this pollen tube is to reach down to the ovaries to allow for fertilization to occur. So this is before fertilization happens or it is a pre fertilization barrier. So we're going to cancel it out because we're looking for post fertilization barriers. So moving on, we have seat incompatible pollen with pistol. This paul um contains the male reproductive gametes and the pistol contains the female reproductive gametes. So fertilization here has not occurred either because fertilization occurs when these two gametes are able to mix. If they're incompatible, they won't be able to mix and this will count as a pre fertilization barrier. So we're going to cancel it out as well, we gon we have option B. The production of sterile pollen again, This problem is what's going to contain the male gametes. If it is sterile, it won't be able to undergo fertilization because it is sterile And so we're going to cancel it out as well because here fertilization has not occurred. Now, option A stays the failure of a hybrid embryo to complete development. So complete development. Here fertilization has taken place because we have an embryo which is when the male and female gametes is able to mix together and it starts developing. So this is going to be a post fertilization barrier because it will occur these failures of the hybrid embryo to complete development. This is going to prevent or it's going to be a barrier for this embryo to reproduce and it's only going to occur post fertilization because we have an embryo. So this is going to be the final answer to our question and this is the end of the video. I really hope this helped you and I hope to see you on the next one.

Verified Solution

Key Concepts

Prefertilization Barriers

Behavioral Isolation

Hybrid Viability and Fertility