why secondary ooctye suspend at meiosis II, why not just complete it?

Question

i do know it will undergo completion after fertilization, but i want to know what's the reaon to it. and since 2nd ooctye suspend at meiosis 2 why not 2nd spermatoctye? thanks alot!!:)

Answer 1

One simple reason: the egg is larger than the sperm. It needs to be larger, because it will be the source of most of what will make up the gametocyte (fertilized egg). While the sperm only needs to carry genetic material (DNA), the egg contributes all of the other cellular material. So (to over-simplify) there's more "material" available to make more sperm than there is to produce more eggs. By suspending that second oocyte, the primary oocyte has more nutrients, etc., allowing it to grow and mature to the extent necessary.

On a practical level, not as many eggs are necessary in the long run. Fertilization is designed so that many sperm compete for one egg. During each woman's monthly cycle, only one egg is available (except for some unusual circumstances, which can produce twins, triplets, etc.). One egg per month! Nature does not produce more than is necessary, I've noticed. That's true of other biological cycles: metabolism, for instance. We have to eat regularly because our body doesn't make extra energy-sources to keep us going all day. Everything is very streamlined. It's interesting.

Anyway, hope that helps!

Answer 2

those polar bodies are created during process of double fertilization due to the balance of things...in most all other species other than animals, these polar bodies become food for the maturing embryo...as for animals, it ensures that a focus be placed only on the larger egg getting the fertilization, room to grow, nourishment as it develops, and so on...not the other two which slough off in the natural process...

Answer 3

I bet that in the nexst three days you'll have an answer that sounds as astute as you question. Sounds. Sounds.