lungy Posted March 13, 2004 Share Posted March 13, 2004 MMMM, Well it seems my Male fronnies (2 of ) Must get there peice of the action when the lady's are Ready for lov'n ... ... This sharing arrangement is most admire-able .... Though i have noticed a small percentage of fry have some shocking barring ... My question is this !!! Could this be from a mixed genetical conception ???? And how long is the egg vunerable for , before it is sealed from the protrusion of further semen ( not the diving kind either ) ... Andy .... Eat those big words Coleman Link to comment Share on other sites More sharing options...
fiona Posted March 13, 2004 Share Posted March 13, 2004 No lungy, only one sperm fertilises an egg. In mammals, it's instantaneous - as soon as a sperm penetrates, the composition of the covering of the egg changes and no further sperm can get in. I would think it would be the same in fish and other animals. It's also the same in plants from memory - once a pollen gets into the egg/seed, no more can follow. That way you get the right number of chromosomes. Link to comment Share on other sites More sharing options...
lungy Posted March 13, 2004 Author Share Posted March 13, 2004 Ok so there were'nt so many big words Andy... Link to comment Share on other sites More sharing options...
YeW Posted March 13, 2004 Share Posted March 13, 2004 Lungy - To translate, no. Fiona - In plants you have double fertilisation (in most Angiosperms anyway). so you get two pollen grains - one unites with the "egg" and the other with a diploid cell near the egg. This diploid cell after fertilisation is triploid (ie: 3n) and develops into the endosperm . Link to comment Share on other sites More sharing options...
lungy Posted March 13, 2004 Author Share Posted March 13, 2004 Fiona In plants you have double fertilisation (in most Angiosperms anyway). so you get two pollen grains - one unites with the "egg" and the other with a diploid cell near the egg. This diploid cell after fertilisation is triploid (ie: 3n) and develops into the endosperm , i hope that helps honey ... Andy... Ps. Welcome back Dave Link to comment Share on other sites More sharing options...
lungy Posted March 13, 2004 Author Share Posted March 13, 2004 Sorry , i did'nt realize Dave had already answered Fiona ... Andy... Link to comment Share on other sites More sharing options...
fiona Posted March 14, 2004 Share Posted March 14, 2004 Hm, that's interesting. I don't think we got into where the endosperm came from in high school biology. So the pollen material joining with the diploid cell triggers the endosperm to form, right? Which would coincide with the fertilisation and subsequent development of the plant embryo. Yeah? Neat mechanism. Link to comment Share on other sites More sharing options...
lungy Posted March 14, 2004 Author Share Posted March 14, 2004 Yes Honey .. Without the introduction of the two ( Pollen & Diploid cell integration ) there is no Endosperm therefore no fertility .. Andy.. Link to comment Share on other sites More sharing options...
Sarah Posted March 14, 2004 Share Posted March 14, 2004 Andy you sure you know what you are talking about or you just taking a punt Link to comment Share on other sites More sharing options...
lungy Posted March 14, 2004 Author Share Posted March 14, 2004 *slap* ... I may be BALD !! But i sure ain't Blonde .. Andy... Link to comment Share on other sites More sharing options...
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