Multiple+Births

=1373763969= toc = Definition: =

[|A multiple birth occurs when more than one fetus is carried to term in a single pregnancy. Different names for multiple births are used, depending on the number of offspring.] HGD, Chapter 3, p.50

= Examples: =



In most cases, human infants are conceived and born one at a time. However, in about 4 out of every 100 births, more than one baby is born, usually twins.

Fraternal Twins or dizygotic twins--originate from two zygotes--twins that come from two sets of ova and sperm. Identical Twins or monozygotic twins--arising from one zygote--when a single zygote, for unknown reasons, separates into two parts, each of which develops into a separate individual. Triplets
 * two thirds of all twins
 * no more alike genetically than any other pair of siblings
 * remaining one-third of twins
 * identical genes


 * More likely after age 35.
 * Role of fertility-enhancing drugs: more likely to deliver multiples than naturally conceived pregnancies.

= Analogies: = Twins are like when the pizza delivery boy gets your order mixed up. even though you only paid for one they give you two pizzas by mistake.

= Mnemonics: = If you're having trouble on the exact wording, think 'birth multiplying the work', then shorten it to as many words as possible. As for the definition, think of the fact that it's referring to the births rather than the children. As for the dizygotic versus monozygotic, it's a matter of the prefix. Think mono as in the sound setting alternative to stereo. Even though there's multiple births, there's only 'one'. With dizygotic, think of how a dizygotic twins are the opposite of what you'd expect, as like multiplying (from multiple births) is the opposite of dividing, so 'di-vide', into di- zygote. Then just think of changing zygote to sound like it's an adjective, to make it to zygotic

=In the News:= I saw this on Facebook and thought it should be on the wiki. I love how they exchange glances with each other. media type="custom" key="22135018" I was watching this clip and here is same mother different father example media type="custom" key="23456794" Birth of Octuplets Puts Focus on Fertility Clinics Three smiling siblings, he says, were the first Japanese-American [|triplets] conceived in a laboratory, while the robust-looking quadruplets were born after sperm was injected into their mother’s eggs with a needle.

[|Twins - Identical and fraternal]

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