Ek sal more vir julle ‘n foto van Ouboet se koek opsit. Moet eers die foto’s by die huis gaan aflaai en op ‘n CD sny en saambring werktoe. Ek dink tog julle moet saamstaan en vir my ‘n memorystick vir my verjaarsdag koop (alla Frankie…. :lol: ) Maar die skimp is eintlik vir my se Mamma en Pappa….
Hier is egter iets wat ons almal kan laat dink…. ‘n Tweeling se ontstaan…
Wikipedia sê die volgende:
Twins are two offspring resulting from the same pregnancy, usually born in close succession. They can be the same or different sex. Twins can either be monozygotic (MZ, colloquially “identical”) or dizygotic (DZ, colloquially “fraternal” or “non-identical”).
Here are five common variations of twinning. The three most common variations are all dizygotic:
- Male–female twins are the most common result, 50 percent of DZ twins and the most common grouping of twins.
- Female DZ twins (sometimes called sororal twins)
- Male DZ twins
The other two variations are monozygotic twins:
- Female MZ twins
- Male MZ twins (least common)
Among non-twin births, male singletons are slightly (about five percent) more common than female singletons. There are also the mirror image variations: this is where the twins develop reverse asymmetric features. About 25% of monozygotic twins are mirror image twins. The rates for singletons vary slightly by country. For example, the sex ratio of birth in the US is 1.05 males/female, while it is 1.07 males/female in Italy. However, males are also more susceptible than females to death in utero, and since the death rate in utero is higher for twins, it leads to female twins being more common than male twins.
Another variety of twins, “polar body twins,” is a phenomenon that was hypothesized to occur and may recently have been proven, very rarely, to exist. This would occur when a portion of a mature egg separates from itself. This is known as the first polar body, and it carries all the same genetic information as the egg. If polar body twins are fact, they would occur when two sperm fertilize both the egg and the first polar body. Generally the first polar body disintegrates. Polar body twinning would result in “half-identical” twins.
Dit alles was vir my baie interessant, en ek is geweldig dankbaar dat ek nie self ‘n tweeling het nie, maar ek het toe op hierdie baie eenvoudige manier afgekom!
Lekker dag vir julle, praat weer more!!!
Naskrif – Ek is nie swanger nie, ek gaan nie weer swanger word nie en dit is nie my babatjies nie. Om eerlik te wees, ek weet nie eers wie se babatjies dit is nie, dit was net eenvoudig ‘n oulike foto wat ek met ‘n e-mail gekry het……