twins (redirected from dizygotic t's)

twins,

n.pl the two siblings produced in the same pregnancy and developed from one egg (identical, monozygotic) or from two eggs fertilized at the same time (fraternal, dizygotic).

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twins

two offspring produced in the same pregnancy. See also dizygotic and monozygotic twins (below).

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conjoined t's

fused, symmetrical twins formed by incomplete division of one embryo into two components. See also siamese twins.

discordant t's

a particular trait is present in only one of the twins.

dissimilar twins

dizygotic twins (below).

dizygotic t's

those that develop from two separate ova fertilized at the same time. They may be of the same sex or of opposite sexes, and are no more similar than any other two offspring of the same parents. Called also fraternal, binovular, dichorial, dissimilar and unlike twins.

fraternal t's

dizygotic twins.

free symmetrical monozygotic t's

see identical twins (below).

identical t's

derived initially from a single zygote; placentas may be shared or separate.

impacted t's

twins so situated during delivery that pressure of one against the other produces simultaneous engagement in the birth canal of both.

induced twins

produced experimentally in ruminants using PMSG or FSH, or by immunization against androstenedione.

monovular twins

see monozygotic twins (below).

monozygotic t's

those which develop from a single ovum that divides after fertilization. Because they share the same set of chromosomes, they are always of the same sex, and are remarkably similar in haircoat color and pattern, teeth, and other respects. Monozygotic twins have exactly the same blood type and can accept tissue or organ transplants from each other. May be free and symmetrical, free and asymmetrical, cojoined and symmetrical or cojoined and asymmetrical. Called also identical, enzygotic, monochorial, mono-ovular, similar, or true twins.

Siamese t's

cojoined twins. See also siamese twins.

similar twins

see monozygotic twins (above).

symmetrical t's

twins of equal size, age and stage of development.

true twins

see monozygotic twins (above).

unequal t's

twins of which one is incompletely developed, called also asymmetric twins.

unlike twins

see dizygotic twins (above).

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Patient discussion about twins.

Q. anything a mother should know about the last period of twin pregnancy? she is in her 7th month and starting to be real heavy... her legs hurt like crazy. anything to help her with?

A. thanks for all the information! I hope everything will go on well...

Q. Is there a bigger risk of autism for the newborn in twin pregnancy?

A. thanks Dominicus!
you're great...

Q. How do I know whether I will get twins or not? Twins have always fascinated me and I cannot wait to get pregnant and have twins. My husband has already bought identical dresses hoping that we will be expecting twins shortly. As I am conceived now that I am pregnant, I am going for a test tomorrow. How do I know whether I will get twins or not?

A. do you have identical twins in your family? if so the chances of you having twins is greater, anyway, checking it out can be done only by ultrasound screening. only then they can see if there are two heartbeats and see two fetuses.