Why are females born with their eggs present? Why doesn't nature allow them to produce eggs like men do sperm?
404721
It depends on the organism.  Humans are just built that way.  Other species like frogs continually generate oocytes (the egg precursor).  What happens in humans is usually not an absolute truth for other animals.  Some animals are asexual (no sperm needed).  All sorts of variations on the theme exists.
503575
I think sex has something to do with it...but I'm not sure.\n\nbut after that, 2 eggs 2 sperms individually...duh
197235
Female- Eggs\nMale- sperm\n\nEggs are made from their stem cells when the female is still in the womb, and then develop when the female goes through puberty.\n\nSperm are made when the male goes through puberty.\n\nThis is for humans, I am unsure of how other organisms do it.
210684
Well Female have power to give birth. Thats is why males are attracted to female.
435869
You can still have eggs without them being fertilized. Chickens or people.You know that little white speck you sometimes see in chicken eggs?(Raw ones)That's an egg that has been fertilized.
466431
The biological reason is so that they can spread their gametes to the female in order to get a fertilized egg, which is useful for reproducing.
148249
the sperm which carry the male sex gene swim faster than the sperm which carry the female sex gene, but the 'female sex sperm' live longer - upto 3 days, compared to the male carriers, which last about 1 day. \nso, to try and conceive a boy, have intercourse right smack bang(literally) when ovulation starts(you can get tests to find out when you are)hopefully, they will find the egg faster. to try for a girl, try having intercourse about 3 and 2 days before ovulation is due.\nits not 100% effective obviously, but worth a try...it's science.
470204
It searches for an egg to fertilize. It only takes one sperm, but thousands can enter your body. The ones that don't make it just come out when you pee.\n\nSorry smarts20, but you are wrong. The ovary releases an egg during ovulation and travels down the fallopian tubes into the uterus where it hopes to be fertilized and become implanted in the uterus. If the egg does not become fertilized you have your period.
761650
I dont know much cuz im just in high school and not pro but heres my understanding:\nLets begin with the possibilities. Two sperm cells cleary would not work cuz of the YY issue and that wouldn't techniquelly be human anymore. However, in the female XX would be human. problem is The egg cell has a jelly coat whihc protects it. The one sperm cell that fertilizes uses enzymes to digest it away and the sperm cell must bind to a receptor site. Since we know very little about the protein world and how these receptors exactly work, just like we dont know how EXactly carrier proteins work in plasma membranes, its difficult to figure how to do it. Since implanting and fusing the two nuclei of the eggs would not initiate these receptor cyets, the zygote may not necessarly divide. It would just be a mutated egg like before and a sitting duck. You wouldn't get mitosis since it still techniquelly thinks its a gamete and wouldn't replicate. Also, too my understanding, the egg and sperm nuclei are drastically different in size and also chemical makeup may vary.Thats my assesment of the situation. Again, I'm not an expert but i think that might be enough to answer the question.
604070
You need to get the sperm to the eggs and with an "army " of sperm, its more likely that some of it will eventually make it past all of the factors that might cause it from not reaching its target... such as when pollen is on a pollinator, some of it is usually lost in flight or just in the regualr movement of the animal that does that job. some plants are pollinated by the wind and the more that is released increases the  chance that some of it will reach the egg. Eggs are usually very close to the adult version of the plant or even within the plant before they are fertalized so they are mainly stationary... with more chances to reach the egg it increases the fecundity.
664813
I AGREE WITH YOU COMPLETELY! Women can make babies regardless of whether or not they reach orgasm. That is absolutely silly that women cant make babies if they dont reach orgasm! I agree with you completely!
812776
First, we didn't all start out as Sperm - that's only half the equation.  We all started out when a  sperm and egg mixed.  That sperm and egg combined and then had all the genetic information to produce each one of us.  That genetic code determined, at that point in time, what each one of use would be (physically).\n\nThe genetic code of some sea animal does not have the ability to produce one of us, and there is no evidence to support the theory that the complex genetic code in any sea animal could mutate to produce one of us.
761640
It's biological.  Men and women tend to chose mates that have features they wish for their offspring to carry.  Women also have been known to seek security or personality traits in their mates so that they can have a provider for the children.  It's subconscious, but it's there.
770439
Women are, men are not.\n\nIn men, the cells that go through meiosis eventually go through special phases to duplicate over and over and over and over and over.  4 gametes (sperm) are created each time for each male cell undergoing meiosis.\n\nFor gametes in women, the process of meiosis leaves one feasable gamete and 3 polar bodies that are discarded.  There cannot be 2 gametes because the cytoplasm must be given to the feasable gamete, along with all the other "good stuff", as the female gamete (egg) must be capable of starting life.\nWomen are born with about 10,000 cells that are capable of going through meiosis, and that is all there will ever be within a woman's body for their whole lifespan.\n\nIf the either sex was born with the gametes "ready to go" most of them would age and die before they were ever used- resulting in the end of the species, as, for humans, sexual reproduction is begun relatively "late" in life.  So, any "ready to go" cells would die before they were used, being useless to the continuation of the species.\n\nCells usually die every 4 months approximately.  Really really.  Except for nerve cells.  But if those die, they're gone.
392040
Hope this sheds some light on it jessica.\n\n\nREPRODUCTION\n\nMost fishes are egg-layers, but many bear living young. Live-bearing fishes may be ovoviviparous, in which the eggs essentially simply hatch within the female, or viviparous, in which the unborn young are supplied nourishment through the mother's tissues. In some ovoviviparous fishes the embryo develops in the egg while the egg is still within its follicular covering within the ovary, and ovulation (or release of the egg) and birth occur at the same time. In other ovoviviparous forms the eggs are released from the protective follicles into the cavity of the hollow ovary, where development continues. In some viviparous fishes the walls of the egg follicle are in intimate contact with the embryo, supplying it with nourishment. In the viviparous sharks, a part of the oviduct, or egg channel, is developed into a uterus, where the modified yolk sacs of the young are closely joined to pockets within the uterus.\n\nIn live-bearing fishes and in some egg-layers, fertilization occurs internally, and methods have been evolved for introducing the sperm into the female's body. In sharks the pelvic fins of the male are modified into intromittent organs called myxoptergia, and in the male topminnows the anal fin is modified into a similar-functioning intromittent organ called the gonopodium.\n\nAt least three modes of reproduction--heterosexual, hermaphroditic, and parthenogenetic--are found in fishes. In the most common form, heterosexual reproduction, there are separate male and female parents, but even here there is considerable variation. In some live-bearing fishes, the female is able to store sperm for up to 8 or even 10 months, and this sperm is used to fertilize new batches of eggs as they develop. In some cases, a female may carry sperm from several males at once.\n\nIn hermaphroditic reproduction, a single fish is both male and female, produces both eggs and sperm (either at the same time or at different times), and mates with other similar hermaphroditic fishes. External self-fertilization occurs in one hermaphroditic fish, which sheds egg and sperm simultaneously. In another, internal self-fertilization may occur. In certain fishes there is a time sequence of hermaphroditism, young fishes reversing their sex as they grow older.\n\nIn parthenogenetic reproduction, unfertilized eggs develop into embryos. This is known to exist in at least one fish species, Poecilia formosa, of the Amazon River; however, even though development proceeds without fertilization in some of these females, mating with a male is still required to stimulate egg development.\n\nParental care also shows great diversity. Some fishes, like the Atlantic herring, form huge schools of males and females and freely shed their eggs and sperm (milt), and then abandon the eggs. Other fishes build nests and care for both the eggs and newly hatched young. Others have evolved methods of carrying the eggs with them, commonly in their mouths, but also in gill cavities or in special pouches on the body.
64857
richard is right.\n\nTo boys4ever: How can you have a creature without an egg to hatch it?  Unless, of course, you are suggesting that some chicken like creature gave live birth to the first chicken!
55901
The eggs and sperm are reabsorbed by the body if they  can not be used.\n\nLink below will give you all the details.