Polygynous mammalian mating systems are quite diverse, varying in how females and territories are guarded, as well as the uses of resources amongst other things. Only around 5% of mating systems in mammals are monogamous.
Male ejaculates are able to modify female behaviour in advantageous ways, often increasing male fitness. This is particularly beneficial to species where the sperm from the last male takes precedence.
In general terms, the sexes within a species may be either competitive (i.e. compete against intrasexually for access to a resource, which is in this case, the opposite sex) or choosy. The ‘choosy’ sex therefore makes a decision about which member of the opposite sex he or she will mate with.
Oogenesis is the female version of gametogenesis and is therefore the female equivalent of spermatogenesis. This process follows the immature, primordial ova right through to its maturation as a fertile ovum (egg).
Two processes which are important in cell division and therefore the creation of gametes (gametogenesis) are meiosis and [...]
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