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Sperm head

sperm head

The anterior, usually ovoid, nucleus-containing part of spermatozoa.


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Bees

Hello everyone, I'm trying to get my head round haplodiploidity in (honey) bees and I think I pretty much get it. I'm just ... areas'. She does this to maintain genetic diversity as she stores the sperm to use all her life. So here's the question: If around 5 to 10 percent of her ...

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by nicholasetew
Sat Sep 22, 2012 7:57 pm
 
Forum: General Discussion
Topic: Bees
Replies: 3
Views: 1638

Re: Mitochondrial inheritance

... from their mother. The mitochondria present in the human or mammalian sperm usually get destroyed after fertilization. There is little amount of mitochondria present at the base of the Head of the sperm. This mitochondria is mainly generally required for the propelling ...

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by greatmicrobiologist
Fri Aug 26, 2011 11:00 am
 
Forum: Human Biology
Topic: Mitochondrial inheritance
Replies: 3
Views: 3402

Mammalian Gametes

... just under the plasma membrane that will release enzymes upon one sperm contact and prevent polyspermy from happening. A release of Ca ++ happens ... thru the fallopian tubes. That is all I can remember off the top of my head. Try wikipedia for mammalian sperm and egg. Under the anatomy heading ...

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by kolean
Wed Sep 02, 2009 10:41 pm
 
Forum: Cell Biology
Topic: Mammalian Gametes
Replies: 3
Views: 8624

Re: Help me with this Biology home work? Anyone PLEASE!!!

... deer confront each other with antlers lowered and engage in butting heads until one of the two gets tired and wanders off into the forest. This ... usually occur in body cells, not in cells that become eggs and sperm. C. Creatures with mutations are unable to reproduce. D. Most mutations ...

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by giselleposse
Tue Apr 15, 2008 9:29 pm
 
Forum: General Discussion
Topic: Help me with this Biology home work? Anyone PLEASE!!!
Replies: 34
Views: 27896

Menopause

... far less obvious than the female equivalent. Just off the top of my head though: female menopause would happen earlier because they are born ... if it did exist then male menopause would occur not because of the sperm numbers running out, but because of the 'machinery' that churns them ...

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by kotoreru
Sun Aug 19, 2007 11:27 am
 
Forum: Human Biology
Topic: Menopause
Replies: 5
Views: 2845
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