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rival sperm in a sentence

1. Some species store sperm through long breeding seasons, as the extra time may allow for interactions with rival sperm.

2. However, there is no evidence that the polymorphism of human sperm is for the purpose of antagonizing rival sperm.

3. The intromittent organ of the male has spines that physically remove rival sperm and also stimulate the female's muscles to contract and expel the sperm.

4. Offensive sperm competition consists of males displacing sperm from the previous male as well as the use of toxic sperm to destroy rival sperm.

5. It is also possible that the siphon sacs assist with sawfish sperm competition by washing away rival sperm from the female's vagina before copulations.

6. To achieve this, the penis must be of sufficient length to reach any rival sperm and to maximally fill the vagina.

7. This means that in the event of a rival male's sperm residing within the reproductive tract of a female, the human penis is able to displace the rival sperm, replacing it with his own.

8. Firstly, by displacing a rival male's sperm, the risk of the rival sperm fertilising the egg is reduced, thus minimising the risk of sperm competition.

9. It has therefore been suggested that the more pronounced coronal ridge, combined with the deeper thrusting, causes the vaginal secretions of the female to be displaced in the same way as rival sperm can be. The first successful penis allotransplant surgery was done in September 2005 in a military hospital in Guangzhou, China.

10. Baker describes in detail how "killer sperm" actively seek out rival sperm and kill them with poison from acrosomes to prevent them from getting to the egg.

11. After copulating with several males, rival sperm carried by a female do not compete directly for access to the eggs.

12. Some species store sperm through long breeding seasons, as the extra time may allow for interactions with rival sperm.