Is fertilization necessary in the production of eggs?
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.
878793
I'm not quite sure I understand... but when something is fertilised internally, it's fertilised within a body. When it's fertilised externally, the eggs are outside the body and the male spreads his sperm over the eggs.\n\nInternal development would be when the embryo develops inside the mother's body. External development would be when the embryo develops in an egg or something.
1067251
As this question stands it is a simple matter of common sense, after fertilization of the egg when it becomes a zygote it is clearly living and unique.  If you want tho know when it is self aware or independent then you have to look to the various definitions of those states.
1033249
the egg stays where it is - in the ovary. it turns into seed there. so the pollen must germinate (into a structure called pollen tube) and this tube grows through the pistil and delivers the germ cells to fertilize the egg. cut open a ripening seed pod of a flower and u will see the growing seeds. or imagine a green pepper cut open or green peas in the pod -  the seeds are attached to something that is called placenta, actually. and before fertilization they were not seeds but eggs. and through this place of attachment they were fertilized. it is not like human egg that itself travels from ovary to uterus and gets fertilized on the way.
914298
How often varies by the breed of the chicken, the type of feed, and other conditions such as weather and whether the bird is molting or not.  The shell of the egg acts as a mammals uterus would, protecting the the contents(baby chick or scrammbled eggs) and housing nutrients.  This is the chickens way of having large numbers of chicks at one time, as eggs that are fertilized do not begin gestation until the proper temperature is maintained on a regular basis.  Chickens will lay eggs over the period of several weeks before sitting on them to produce the correct thermo-environment.  Not all eggs are fertilized because just like humans, a sperm donor is needed.  A chicken may "be with" a rooster only once, yet produce fertilized eggs for several days.  Molting is a period when the chicken is going through physical changes, during this time no eggs are produced.  A sign of molting is loss of feathers and bad mood swings!  Molting occurs about once a year in mature birds.  Sometimes eggs used for human consumption are fertilized unintentionally.  These eggs have a red dot in the white of the egg.  This is the reason most cooks crack eggs into a separate bowl before adding them to their recipes.  The red dot would have turn into a chick had the egg not been cooled by refridgeration.  sometimes eggs are not produced because the diet is lacking certain nutrients, usually feeding the chickens the used egg shells from the kitchen will help to cure this deficiency and the bird will begin to produce eggs.  Chickens are an inexpencive yet interesting animal that can be lots of fun raising with children.  Also, their are minature chickens and chickens that have different colored eggs known as easter egg chickens(anaconas, i think) Its been a while since i raised chickens but it was quite an experience, hope this helps!
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
367063
The sperm and egg (1n) come from the gametophyte through mitosis. After fertilization, the zygote grows into a sporophyte (2n). The sporophyte creates spores (1n) by meiosis which grows into a gametophyte (1n). It's a cycle! Hope this helps!
910277
well, for one, males shouldn't have to produce so much sperm to fertilize one egg. During ejackulation, thousands of sperm are released. It could be refined to release fewer to maximize potential of the sperm
30223
It is easier to extract sperm which involves the guy just ejaculating into a cup (a natural enough process which they do anyway watching porn so why waste good useful resources) while to get eggs woman have to undergo various hormonal injection to enable the ovaries to produce more eggs than the single one they ovulate every month, these process are not only painful but requires expensive costs thus for several useful eggs the costs are very high indeed while a single male is able to ejaculate millions of sperm in a single squirt, thus the price difference.
305268
His testicles will always produce sperm. However, he may have to have the sperm removed surgically to fertilize an egg.
902693
The answer is an unequivocal "NO"!  For starters, lets look at the rationale against such a proposition.  \n\nEvolutionarily speaking, sexual reproduction is important in that it has the advantage over asexual reproduction of mixing genetic combinations available to the offspring.  In the human species, this sexual reproduction requires both a male and a female.  What accompanies these facts is that the female is genetically prepared to carry a child once pregnant.  Such features which are vital to this are a uterus, the hormones estrogen and progesterone which prepare the uterus for implantation, ovaries to supply eggs, and a vaginal canal for birthing.  All of these features are primary sex characteristics that can only develop in the ABSENCE of a "Y" chromosome.  Evolutionarily, then, it is to the advantage of the species that phenotypic distinctions between males and females exist, and these physical differences preclude the possibility of the male of the species to be capable of pregnancy.  On this logic alone, men can not become pregnant.  But there is more evidence.\n\nSecondly, think about this:  humans and our ancestors have had millions of years to develop such features, if it were in fact possible, but it has NOT happened.  Why not?  Because there is no SELECTIVE ADVANTAGE for the human species of men acquiring these features and abilities. \n\nThird, there ARE cases of individuals that receive extra SEX chromosomes (look up Klinefelters and Turner' syndrome, for example) where individuals are born with XXY and XYY.  XXY individuals, as a rule, are infertile and can not produce children.  XYY individuals are fertile but are phenotypically male and do not develop uteruses and other features necessary to become impregnated.  So even in the cases of chromosal conditions that might perhaps favor male pregnancy, we do not observe males with the ability to be so.\n\nSo, IF a male had eggs they could not be fertilized because there is no way that the design of a male can receive semen into the genetalia.  But even if this were possible, there would be no place for the fertilized eggs to implant.  And if even they could implant, they couldnt grow because estrogen and progesterone are not present in high enough quantities in males to prepare the uterus (high levels of these hormones would have produced a female during development of the fetus).  This all boils down to the simple and obvious reality that males can not become pregnant.\n\nSomeone might perhaps argue, well it would be possible if certain mutations occurred.  This also is false.  Why?  Because evolution is a process that moves down a one-way street.  While such capability is present in lower organisms, higher animals are too specialized to be capable of such a transformation.  Even if all the proper sets of supposed mutations had amassed in one organism, that organism would either (one) not survive and be spontaneously aborted in utero, or (two) be born as an infertile individual.  Again, only lower animals with less well specialized sexual reproductive organs are capable of self-fertilization and "pregnancy" (flowering plants, for example, are capable of this).\n\nFinally, a genotypic male could undergo gender reassignment and become female, but a uterus and other "equipment" would have to be transplanted and various hormones taken.  I imagine, in theory, that this individual would be capable of becoming pregnant but in this scenario "he" is no longer "male".  \n\nGood question, but the answer is NO!
318382
Yes. Pre-ejaculate contains sperm cells, and it takes just one to fertilize an egg.
1182923
Just one. \n\nVery few animals produce more than one offspring per egg.
512952
In vitro fertilization
809779
1. b, because even if the father was heterzygous, there would still be a 3:1 ratio of brown eyed offspring\n2.d, autotrophs are organisms that produce their own food and do not need to  get nutrients from other sources\n3. True, I believe that fertilization occurs in all sexuallly reproducing species, but there are some organisms that reproduce asexually, but you may not be talking about those.\n4. False, There are asexual organisms that are eukaryotic
209788
Yes. You are born with all the eggs you can possibly need during your fertile years. They are  held in a sort of 'suspended animation' in the ovaries, until one is released each month. Then, the one either meets up with a lucky sperm and implants itself or is released during your cycle each month.\n\nI had to explain this to a college roomie who thought women "made a new egg each month"..
757352
Certainly not.  There are tons of unicellular organisms like amoeba and other protozoa that are quite nicely alive, but don't have any form of sexual reproduction, so don't come from an egg.