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Cryptic female choice is a form of mate choice which occurs both in pre- and post-copulatory circumstances in which females of certain species use physical or chemical mechanisms to control a male's success of fertilizing their ova or ovum; i.e. by selecting whether sperm are successful in fertilizing their eggs or not.
The mammalian female reproductive system contains three main divisions: the vagina and uterus, which act as the receptacle for the sperm, the ovaries, which produce the female's ova, and the vulva, which consists of the labia and clitoris. The vagina, uterus and ovaries are always internal while the vulva is external.
Multiple studies have shown that the physical contact between the sperm and the egg can cause a chemical reaction in the female. [2] This reaction occurs when the egg comes in contact with non-compatible surface glycans and can impact the sperm's potential for fertilization by causing structural changes in the sperm's surface glycans. [2]
Dr. Ruth O. Arumala, co-chief medical officer at Zuri Fertility, says there are many factors to consider when it comes to egg freezing and thawing, including the way the egg was frozen and the ...
Lactation describes the secretion of milk from the mammary glands and the period of time that a mother lactates to feed her young. The process naturally occurs with all sexually mature female mammals, although it may predate mammals. [1] The process of feeding milk in all female creatures is called nursing, and in humans it is also called ...
The results were interpreted as egg-driven sperm selection against related sperm. Female fruit flies (Drosophila melanogaster) were mated with males of four different degrees of genetic relatedness in competition experiments. [57] Sperm competitive ability was negatively correlated with relatedness.
Even if an egg passes the float test, look for other signs that an egg has gone bad—just in case. The cracks in the shell may create an opportunity for bacteria to get to the inside of the egg.
Sperm storage organs in the fruit fly Drosophila melanogaster.Female was first mated with GFP-male and then re-mated with RFP-male. Female sperm storage is a biological process and often a type of sexual selection in which sperm cells transferred to a female during mating are temporarily retained within a specific part of the reproductive tract before the oocyte, or egg, is fertilized.