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The chance the other child is a girl is 1 / 2 . This is a very different procedure from (1) picking a two-child family at random from all families with two children, at least one a boy, born on a Tuesday. The chance the family consists of a boy and a girl is 14 / 27 , about 0.52.
1 blastocyst: Inactivation of one X chromosome: 4 2–3 Development of Wolffian ducts: 5 7 Migration of primordial germ cells in the undifferentiated gonad: 6 10–15 Development of Müllerian ducts: 7 13–20 Differentiation of seminiferous tubules: 8 30 Regression of Müllerian ducts in male fetus: 8 32–35 Appearance of Leydig cells.
Image credits: MontEcola #5. My wife is an identical twin. When we first started dating I could tell them apart from their voices, smell, makeup, and eyes.
The power of twin designs arises from the fact that twins may be either identical (monozygotic (MZ), i.e. developing from a single fertilized egg and therefore sharing all of their polymorphic alleles) or fraternal (dizygotic (DZ), i.e. developing from two fertilized eggs and therefore sharing on average 50% of their alleles, the same level of genetic similarity found in non-twin siblings).
Odds of having identical quadruplets are about one in 15 million — which makes Mercedes and Jonathan Sandhu, and their four identical daughters, very special.
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Similarly, if we know the older child is a boy, then we have the following options. The boy could have: a younger sister OR a younger brother. There are no other choices. Therefore, again, the probability is 1 girl vs 1 boy, so 1/2. —Preceding unsigned comment added by 198.96.180.245 20:44, 27 August 2008 (UTC)
The mother of one of the children became suspicious after one week, at which point she contacted the hospital. The hospital initially blamed the mother's concerns on her mental health issues. The child's father, through a right to information request, found the couple with whom their child was switched, and a DNA test was carried out. Each set ...