Multiple Births :: essays research papers

Multiple BirthsMultiple kinds are rare in humans with twins as being the most harsh formof this event. Multiple births can arise in many different combinations of waysbut the probability of giving birth to more than one kidskin remains fairlyconstant when compared to the entire human race. The chances of multiple birthscan also vary from race and genetic background. Scientist and researchers donot know what the read ca practise of these variations is but many of them feel thatit is caused by hormone differences between different racial groups and/or thedifference in social class.The prenatal and babe mortality is much higher in multiple pregnanciesthan in pregnancies that only involves one child. The danger of premature birthalso increased with the higher come in of offspring that are involved. In manymultiple births, not all of the children survived to childhood or were born(p) dead.Through the advances in technology, the survival rate of infants born in amultiple pregnancy has increased. The first quintuplets, five babies born in asingle pregnancy, to survive in medical history were the Dionne quintuplets.The use of drugs that treat female sterility, or fertility drugs, mayincrease the chances of giving birth to multiple children. These drugs causethe ovaries to release an egg once a calendar month but in some cases they release morethan one egg, sometimes releasing several at a time, increasing the chances of amultiple birth. The drug clomiphene citrate is one of the most widely takenfertility drug and has resulted in the birth of twins about once in any twelvebirths, much greater than the chances of the birth of natural twins.Twins are the most common form of a multiple pregnancy. About one ineighty-seven births result in the birth of twins. Twins can be brotherlike, alsoknown as dizygotic twins, or identical, also called monozygotic twins, with thebirth of identical twins being the rarest, occurring about four times in everythousand births, abou t one-forth as often as the birth of fraternal twins. Thisratio of the birth of twins to the total number of births remains fairlyconstant but the birth of fraternal twins can alter greatly. biovular twinsare most common among black African followed by people of European origin.Asian races originating from the orient are the least likely to erupt birth tofraternal twins.The birth of twins can occur in two different ways, the medical dressing ofa single egg or the fertilization of two eggs. In the case of dizygotic twins,the womans ovaries release two eggs about the same time instead of one, with