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Asked by Louise to Matt, David on 9 Mar 2018.
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David Howard answered on 9 Mar 2018:
The offspring from both sets of twins would genetically be the equivalent of siblings (they would share about a quarter of their DNA), even though they are cousins.
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Matt Bawn answered on 9 Mar 2018:
Yes (assuming one pair of identical twins is male and the other female).
Comments
Stéphane commented on :
They will be genetically sibling.
Mothers will share 50% of their genes but due to crossing over, the genes might be the same 50% from both mothers. Same things for the fathers.
Even with these differences, they are very likely to be considered as such.
Gemma commented on :
Yes – you’re right! They would share, on average, half their DNA, just like siblings, but would socially be cousins!
Gemma commented on :
I’m still loving this question! I kept thinking about drawing out the family tree using correct pedigree nomenclature (like we do in clinic for genetic counselling) and how that would look – have a go!
https://www.genomicseducation.hee.nhs.uk/takingfamilyhistory101/how-do-i-draw-a-family-history/
https://www.genomicseducation.hee.nhs.uk/news/item/407-new-family-history-films-now-available/