Bio ! will mark brainliest which of the following is an example of prezygotic isolating mechanisms? a. two strains of rice produce a hybrid, which can produce fertile offspring, but its offspring is small and sterile. b. a horse and a donkey may interbreed, but the offspring, a mule, is not fertile. c. the sperm of species a dies when it comes in contact with the female reproductive tract of species b. d. two salamander species mate, but the offspring does not complete development and dies. i think its b, but i'm not too good with stuff like this. so i thought i'd get a second opinion (and an you tons!

Hi there!

A prezygotic isolating mechanism is a mechanism that causes something to happen, not allowing the organisms to breed before fertilization. I'll explain each one for you.

A - That is postzygotic because the organisms were not stopped before fertilization. The result is a sterile organism.
B - Again, that is postzygotic because the organism was produced. 
C - This is prezygotic! The sperm dying shows that something is in action to prevent fertilization, meaning that it cannot happen.
D - Fertilization was successful, so it is postzygotic.

ANSWER:
C - the sperm dies when it reaches the female tract

If you need help with any more problems, feel free to message me and I'd be more than happy to help you work through them and provide explanations.

Hope this helps!! :)
If there's anything else that I can help you with, please let me know!

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