Hereditary or coincidence?
This article will discuss the genetics of twinning and the possibility of a multiple birth family. My daughter found last year that he was expecting twins. This was a shock and the first time that our experience of the family with twins our known family tree. Her husband had a family history a little car with the twins, but this really could have been twins? The initial search on the Internetconfusing, contradictory and written extensively on this subject seems to be more fiction than fact. After ordering the data, even if some things have become apparent. There are two types of twins, identical and fraternal twins.
Identical twins
Identical twins come from the same egg. They are described as monozygotic. The egg divides into two separate embryos before day 8. Grow with exactly the same DNA, but grow apartfingerprints. The rate of identical twins is 1 in every 250 births. It seems that identical twins are random and not an inherited trait. The identical twins are no more likely than the average woman to have twins themselves.
Twins
Fraternal twinning occurs when the mother has two eggs and each egg is fertilized by separate sperm. Children may look similar, so that siblings are often similar.Can also be very different. Cufflinks can be about sex or a boy and a girl. The rate of twins is approximately 1 in every 83 births.
Fraternal twinning is inherited on the maternal side only. Dad can pass along the characteristic of having twin girls, but can not alter the fact that his wife will have twins or not. Fraternal twins are much more likely to have a set of twinsthemselves. Two at a rate of two and half times the normal population frequency. If a woman has had twins, is 4.3 times more likely to be twins again.
Our twins
Because he had not known twinning on our side of the family tree, immediately concluded that the girls expect identical twins. They seemed to be very close to the same size. We discussed how to distinguish them and we is also considering putting a small tattoo foot point of the 'children. On arrival we found that Makayla had red hair and blue eyes, while McKenzie was a beautiful brown eyes, brown hair. There were obviously identical. We began to look more carefully and discovered that a great-grandmother was adopted and there was nothing known about their genetic history. We also found that there may have been other factors that may have contributed to the arrival oftwins>.
Other factors
The age of the mother may affect the likelihood of twins. Up to 35 years, the probability of giving birth to twins grows each year, then drop it later. My daughter is only 27 years old when she conceived. Women who are tall and well fed (a little overweight) are more likely to have twins. They might be more easily able to lead and support the twins. My daughter is not high, and she is not overweight.
Geminiare more likely with each successive birth. This would be her fourth birth. So this is for you. Another factor is the use of fertility drugs. Since he already had three small children, that was definitely not the use of fertility drugs. The recent increase in twin births, possibly attributable to the use of fertility drugs and the tendency for women to wait until the end of his life to start their families. It is estimated that about 20% of the current twin births are caused by livingby fertility drugs. The number of twins increased by 65% since 1980.
Ethnicity also affects the partnership. This is hereditary, but some ethnic groups are more likely to give birth to twins. A Caucasian woman is two times more likely to twins as an Asian woman. A descendant of Africa is more than twice as likely as Caucasian twins and 4 times more likely than an Asian. Finally, there is evidence that hormone levels can affect athe ability of women to conceive twins. follicle-stimulating hormone (FSH) may be greater in mothers of twins. FSH is necessary for growth and fertility of eggs is a commonly used drug.
Summary
If you have twins, are likely to be brothers. In fact, it seems that all identical twins are unpredictable. If you are expecting twins, their spouses genetics have nothing to do with it. First look at your tree, thenanalyze the remaining factors. After all this, twinning is only sometimes inexplicable as anything more than an act of God, Yes, I am a handful, but very funny. I recommend you seek help for the first few weeks after birth. There are support groups for mothers of twins in many communities. You can switch the car seats, strollers and clothing room. In this way you can save a bit 'in the cost of raising two children instead of one. You can findThese support groups online.
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