Now here's a little quiz in which even the biology teachers can participate. We know that the sperm cell only delivers its nuclei to the egg cell at fertilisation. Why is it that the 2 cells (egg and sperm)do not simply fuse all of their cytoplasm together? It is known that none of the organelles of the sperm cell are delivered to the egg, only the nuclei.So, why?
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Ok. Well what if we add Sodium hydride anions, with potassium tetrachloride. Wouldnt the sperm cell be able to prouduce the phospate of iron?
ReplyDeleteNo idea. Its 7.27am, a time when most people are happy their eggs are unfertilised anyhow. But what about an evolutionary mechanism to cut down on viral transfer in the cytoplasm? The less the egg receives, the less likely one is to get contaminated. And Joan Collins was recently giving an interview on manners and when the reporter offered his/her hand for shaking Ms Collins is reported to have replied "I don't do hands". :)
ReplyDeleteniba
Interesting but the structure you need to consider is much bigger than a virus but not as large as the nucleus.
ReplyDeleteits to prevent the conflicts between mitocondria of the egg and the sperm cell. this is why the genetic code present in anyone's mitochondria (which of course is different from the one you possess) comes all from their mother. right? mr burrell
ReplyDeleteAnytime there is cell fusion there appears to be a confict between each cells mitochondrial restriction enzymes. In the unicellular algae chlamydomonas the cells fall into 2 types one called + (many mitochondria) and - few mitochondria). Therefore in the sexual phase of the life cycle they avoid the conflict. The structure of a sperm cell particularly the narrowed 'neck' region separates the nuclei of the sperm cell from its mitochondria. Thus during fertilisation and the acrosome reaction the nuclei can enter the egg cell but not its mitochondria. Thus as you say all mitochondria are inherited via the maternal line. It is argued that this is the basis of gender.
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