Sentences with phrase «sperm after mating»
«Crazy sperm forms are evolving because female reproductive tracts are evolving that bias fertilization in favor of these weird, specific traits,» Pitnick says, pointing to a female's active role in selecting preferred sperm after mating.
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After mating, the female stashes sperm from several males in a specialized organ called a spermatheca before using some of the stored sperm to fertilize her eggs.
In previous experiments, they had analysed the sperm quality of the mice after only eight generations of mating.
After a female chooses a large male, he places his sperm packet inside her oviduct and stays with her until she spawns so that no other male has a chance to mate with her.
You can avoid this by feeding the female first although, warns Clarke, «we have had females mating who were so well fed that shortly after mating they moulted again, thus losing the sperm stored in the exoskeleton».
After each pair had mated and the male's palp was left in the female, the researchers dissected the female and counted the sperm in her abdomen and the amount remaining in the embedded palp.
Female fruit flies become aggressive after mating because of a peptide in the male's sperm.
• A female chicken will mate with many different males, but if she decides, after the deed is done, that she doesn't want a particular rooster's offspring, she can eject his sperm.