Rare Phenomenon: What Happens When 2 Sperm Fertilize the Same Egg?

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Discussion Overview

The discussion centers on the phenomenon of two sperm fertilizing the same egg, exploring the biological implications and outcomes of such an event. Participants touch on related concepts in human genetics and plant biology, examining both theoretical and practical aspects of polyspermy and its consequences.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant notes the rarity of two sperm fertilizing the same egg due to the sodium ion channel's role in preventing polyspermy.
  • Another participant suggests a potential connection to genetic conditions like Klinefelter syndrome, although they express uncertainty about the relationship.
  • One claim states that if two sperm fertilize the egg, the resulting triploid cell would not survive due to chromosomal abnormalities.
  • Another participant proposes that immediate cell death could occur, or if the cell persists, it might develop into a partial hydatidiform mole resulting from diandry.
  • A later reply reiterates the possibility of a partial hydatidiform mole and discusses the associated risks, including correlations with uterine cancer.
  • In contrast, a participant mentions that in plants, similar occurrences can lead to triploid offspring, which may survive but cannot reproduce sexually due to meiotic complications.

Areas of Agreement / Disagreement

Participants express differing views on the outcomes of two sperm fertilizing the same egg, with some suggesting cell death and others proposing the possibility of a hydatidiform mole. The discussion remains unresolved regarding the exact implications and outcomes of such an event.

Contextual Notes

Participants reference various genetic conditions and biological processes, but there is a lack of consensus on the mechanisms and outcomes of polyspermy in humans versus plants. The discussion includes assumptions about the viability of triploid cells and the implications of chromosomal abnormalities.

jaxnnux
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Hello,

Quick Q. What happens when 2 sperm fertilize the same egg? Obviously it's extremely rare due the sodium ion channel's ability to quickly change the electric potential across the egg's membrane, preventing polyspermy.

But what would happen if two sperm nailed the egg at EXACTLY the same time?

Thanks.
 
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this interests me. Though i honestly don't know much about it. well anything beyond meiosis and the chromosome diseases.

But your question seems a lot like klinefelter/jacobs where u have a double male Y chromosome.

and well you can study up on those syndromes.

but don't take my word for this. i have no idea if this is how they get it or not.
 
Nothing would happen. Due to the chromosome abnormality (triploid instead of diploid), the cell wouldn't survive.
 
You might end up with immediate cell death or if the cell persists, you might get a partial hydatidiform mole arising from diandry (two haploid sperms fertilising a haploid ovum giving a triploid zygote).
 
Curious3141 said:
You might end up with immediate cell death or if the cell persists, you might get a partial hydatidiform mole arising from diandry (two haploid sperms fertilising a haploid ovum giving a triploid zygote).
Oh, I forgot about moles. Scary because of their correlation to uterine cancer, not to mention that you think you're pregnant and find out it's a nasty clump of tumor-like cells, and a year-long wait before you're allowed to try again.
 
In plants, this actually happens sometimes. The offspring ends up triploid, so it sometimes dies, but triploid plants can survive sometimes. They just can't reproduce sexually because everything gets messed up in meiosis.
 

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