Formation of Twins : Intermediate / A.D.A.M., Inc.

New York, N.Y. : Films Media Group, [2013], ©2010.

English

1 online resource (1 video file (4 min.)) : sound, color

eMedia

51556 Films Media Group

(OCoLC)844439053

Twins are rare, occurring in about 1 percent of all pregnancies. Of that number, 30 percent are identical twins. The other 70 percent are nonidentical, or fraternal, twins. A single baby, identical twins, and fraternal twins differ from one another in their development. With a single baby, when fertilization occurs the egg cell is fertilized by a single sperm cell to form a zygote. Over the next few days, the fertilized egg cell divides repeatedly to form a structure called a blastocyst, which is composed of hundreds of cells. If you looked inside the one-week-old blastocyst, you would see a mass of cells that will form the embryo. The blastocyst continues traveling toward the uterus, where it will implant in the uterine lining and grow into a single baby. Identical twins start from a single fertilized egg cell, or zygote, and therefore are called monozygotic twins. The egg cell is fertilized by a single sperm cell, as it is with a single baby.

Encoded with permission for digital streaming by Films Media Group on March 14, 2013.
Films on Demand is distributed by Films Media Group for Films for the Humanities & Sciences, Cambridge Educational, Meridian Education, and Shopware.
Formation of Twins: Intermediate (4:00).
Title from distributor's description.

Originally produced: A.D.A.M., Inc, 2010

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