Do children of Monozygotic twins have the same relatedness as siblings?

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Discussion Overview

The discussion centers around the genetic relatedness of children born to monozygotic twins and the implications of their genetic similarities. Participants explore the nature of fingerprints in monozygotic twins and the genetic relationships of their offspring, considering both theoretical scenarios and biological principles.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants assert that monozygotic twins do not have identical fingerprints, suggesting that environmental factors in the womb play a significant role in fingerprint development.
  • There is a hypothetical scenario presented where two pairs of monozygotic twins marry each other, raising questions about the genetic relatedness of their children compared to typical siblings.
  • One participant proposes that if A1 and B1 have a child, that child would have the same genetic makeup as a child of A2 and B2, leading to a discussion about whether these children would be genetically identical or merely siblings.
  • Another participant emphasizes the need to consider cases with multiple children, questioning whether siblings from these pairings would be identical.
  • A later reply confirms that children of A1 and B1 and children of A2 and B2 would have the same relatedness as siblings, but does not resolve the broader implications of genetic similarity.

Areas of Agreement / Disagreement

Participants express differing views on the genetic relatedness of children born to monozygotic twins, with some agreeing that these children would be similar to siblings, while others explore the nuances of genetic inheritance and environmental influences. The discussion remains unresolved regarding the implications of these relationships.

Contextual Notes

The discussion includes assumptions about genetic inheritance and environmental factors that are not fully explored or defined, leaving open questions about the nature of genetic relatedness in the proposed scenarios.

Chitose
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Hello, Chitose wonder chick again.

First to tell This is NOT a homework.

..........

Monozygotic twins are twin from same agg right? which mean Almost every of their indentical (Sex, DNA, Chromosome, bra bra bra...).

In some forum in my country their argue about does Monozygotic twins have the same fingerprint or not, so I ask you here.

1. Dose Monozygotic twins hava the same finger print?

............
2.

Miss A1 and A2 are Monozygotic twins.
Mr. B1 and B2 are Monozygotic twins as well.

If A1 marry B1 (or B2, same case)
and A2 marry B2 (or B1, same case)

What going to happan to their kids? almost like twin? (but not twin)
Are they going to have same DNA even they not twin?

If not, why?
Both pair of parent havs same DNA right?
because Mutation?

............

PS. English is not my native languge, forgive me if I'm wrong in gramma or spelling.
 
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1. No, they don't have identical finger prints.

This tells us that finger prints at birth are more dominantly determined by the local environment within the uterus, rather than by genetic instructions.

Since two fetuses sharing a womb will still experience somewhat different conditions, the variability in finger prints between monozygotic twins should be about the same as for heterozygotic twins.
 
Chitose said:
2.

Miss A1 and A2 are Monozygotic twins.
Mr. B1 and B2 are Monozygotic twins as well.

If A1 marry B1 (or B2, same case)
and A2 marry B2 (or B1, same case)

What going to happan to their kids? almost like twin? (but not twin)
Are they going to have same DNA even they not twin?

If not, why?
Both pair of parent havs same DNA right?
because Mutation?

Consider the case where A1 and B1 have a second kid. Since A1 has an identical genetic makeup to A2 and B1 has an identical genetic makeup to B2, this situation should be the same as A2 and B2 having a kid.
 
I mean both pair have only one kid.
what I wonder is son of A1 and B1 going to have same genetic instructer to son of A2 and B2? (same as twins, not same as brother)
 
Well, first you should consider the case where A1 and B1 have two kids. In this case, will the two kids be identical. Why or why not?
 
Oh I see... they just have identical as brother...
(aww man... why i didn't though about this case earlier.)
 
Correct. If A1 and B1 have a child, AB1, and A2 and B2 have a child, AB2, then AB1 and AB2 will have the same relatedness as siblings.