Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Reproductive barriers in vertebrates
| (A) | Before copulation |
| visual | |
| auditory | |
| olfactory | |
| (B) | During copulation |
| optimal complementarity between male and female sexual organs | |
| (C) | After copulation |
| before oocyte fertilization | |
| during sperm—oocyte interaction | |
| after oocyte fertilization, but before zygote formation | |
| after zygote formation |
