Free Republic
Browse · Search
General/Chat
Topics · Post Article

Skip to comments.

Scientists stunned by discovery of 'semi-identical' twins
The Guardian ^ | February 27, 2019 | Nicola Davis

Posted on 02/28/2019 4:04:42 PM PST by EveningStar

Boy and girl, now four, are only the second case of ‘sesquizygotic’ twins recorded

A pair of twins have stunned researchers after it emerged that they are neither identical nor fraternal – but something in between.

The team say the boy and girl, now four years old, are the second case of semi-identical twins ever recorded, and the first to be spotted while the mother was pregnant.

The situation was a surprise to the researchers. An ultrasound of the 28-year old mother at six weeks suggested the twins were identical – with signs including a shared placenta. But it soon became clear all was not as it seemed.

(Excerpt) Read more at theguardian.com ...


TOPICS: Health/Medicine; Science
KEYWORDS: australia; biology; godsgravesglyphs; helixmakemineadouble; semiidenticaltwins; sesquizygotictwins; twins
Navigation: use the links below to view more comments.
first previous 1-2021-4041-51 last
To: House Atreides

“By what mechanism did the two absolutely identical maternal haploids come about?”

That is a separate issue than what I addressed: that “an unfertized human egg could split into two”.

Think about why an unfertilized egg can’t split in to two.


41 posted on 02/28/2019 6:27:08 PM PST by ifinnegan (Democrats kill babies and harvest their organs to sell)
[ Post Reply | Private Reply | To 36 | View Replies]

To: House Atreides

If you read the article then your problem is comprehending the information?


42 posted on 02/28/2019 6:53:31 PM PST by TexasGator (Z1z)
[ Post Reply | Private Reply | To 23 | View Replies]

To: Kriggerel

(M.Sc. in Reproductive Physiology, in case you wondered).
****************************************************
Yay...some useful expertise. In this situation, can you explain how two identical maternal haploids arose - I’m assuming from what originally was a single haploid. I asked another poster who seemed that he/she might have some expertise but that poster preferred to play “cute” instead of answering.

Thanks.


43 posted on 02/28/2019 6:58:04 PM PST by House Atreides (Boycott the NFL 100% — PERMANENT)
[ Post Reply | Private Reply | To 40 | View Replies]

To: Tax-chick

Perhaps it was the freemartin issue, I was reading about dairy farming and they want heifers!


44 posted on 02/28/2019 7:44:31 PM PST by Chickensoup (Leftists totalitarian fascists appear to be planning to eradicate conservatives)
[ Post Reply | Private Reply | To 26 | View Replies]

To: House Atreides

Actually, from the article itself, the ovum actually split three ways. The problem with polyspermy is that you get a polyploid situation in the ovum, which has to be evened out during the division cycles, or the resultant daughter cells quickly become non-viable (you can see polyploidy in some plants, which can adapt to tetraploid, and hexaploid situations, but animal cells generally cannot). What happened was that the fertilised ovum split into two daughter cells, each with maternal haploid chromosomes matched up to paternal haploid, as is normal, although the paternal chromosomes themselves were a mix n’ match from each of the two sperm. Still The two normal maternal haploid (from the first mitosis event) matched up to the normal compliment of paternal haploid formed paternal chromosomal chimeras, but still, everything was hunky-dory. There was also an extra mitotic event, where the two ‘odd’ sets of paternal haploid chromosomes were forced to match with each other, and this third cell quickly became non-viable.

Best I can answer it, and still keep it in reasonably layman’s terms. Not sure if that helps.


45 posted on 02/28/2019 7:48:14 PM PST by Kriggerel ("All great truths are hard and bitter, but lies... are sweeter than wild honey" (Ragnar Redbeard))
[ Post Reply | Private Reply | To 43 | View Replies]

To: originalbuckeye

Non quite there are modi and momo identical twins. Modi is common, momo is very high risk sadly


46 posted on 02/28/2019 8:38:46 PM PST by vmpolesov
[ Post Reply | Private Reply | To 13 | View Replies]

To: Kriggerel

Quadrotriticale.

(Sorry. Couldn’t resist.)


47 posted on 02/28/2019 10:35:48 PM PST by YogicCowboy ("I am not entirely on anyone's side, because no one is entirely on mine." - J. R. R. Tolkien)
[ Post Reply | Private Reply | To 45 | View Replies]

To: StayAt HomeMother; Ernest_at_the_Beach; 1ofmanyfree; 21twelve; 24Karet; 2ndDivisionVet; 31R1O; ...
Thanks EveningStar.

48 posted on 03/02/2019 2:55:11 PM PST by SunkenCiv (and btw -- https://www.gofundme.com/for-rotator-cuff-repair-surgery)
[ Post Reply | Private Reply | View Replies]

To: SunkenCiv
Thanks EveningStar.

As usual, I forgot to ping you. Sorry. :(

49 posted on 03/02/2019 4:35:13 PM PST by EveningStar (I am a Non-Cultist Trump Supporter.)
[ Post Reply | Private Reply | To 48 | View Replies]

To: Chickensoup

Look up ‘freemartin’. Somewhat common in cattle; now, it seems to also (very rarely) occur in humans, too.


50 posted on 03/02/2019 11:48:20 PM PST by ApplegateRanch (Love me, love my guns!�)
[ Post Reply | Private Reply | To 17 | View Replies]

To: EveningStar
:^) No problemo.

51 posted on 03/03/2019 7:03:45 AM PST by SunkenCiv (and btw -- https://www.gofundme.com/for-rotator-cuff-repair-surgery)
[ Post Reply | Private Reply | To 49 | View Replies]


Navigation: use the links below to view more comments.
first previous 1-2021-4041-51 last

Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.

Free Republic
Browse · Search
General/Chat
Topics · Post Article

FreeRepublic, LLC, PO BOX 9771, FRESNO, CA 93794
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson