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Quick Vocabulary. LEFT. Think, Pair, Write: What do you notice ? Write about the placenta, the chorion and the amniotic sac. Do identical twins always share a placenta during pregnancy?.

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slide2

LEFT

Think, Pair, Write:

What do you notice?

Write about the placenta, the chorion and the amniotic sac

do identical twins always share a placenta during pregnancy
Do identical twins always share a placenta during pregnancy?

No, this is a myth. Even many doctors will mistakenly identify twins as fraternal because there are two placentas. It depends on when the egg splits. If it is early enough, the two embryos will implant separately in the uterus and develop individual placentas. If the split occurs later, they may share a placenta.

slide4

LEFT

Use your book, pg 518 – 520:

Create two lists:

Important things for fetal growth

Things that are bad for fetal growth

Think, Pair, Write:

What do you notice?

Write about the umbilical cord.

The placenta contains many blood vessels from both the fetus and the mother, but they are NOT directly connected.

stomach vs uterus
Stomach vs. Uterus

LEFT

Think, Pair, Write:

What do you notice?

Write about the differences in location and function of the stomach and the uterus.

slide7

http://kids.britannica.com/comptons/art-90799/Identical-twins-left-and-fraternal-twins-right-both-get-nourishmenthttp://kids.britannica.com/comptons/art-90799/Identical-twins-left-and-fraternal-twins-right-both-get-nourishment

  • http://www.smh.com.au/news/health/double-trouble-this-pair-could-hardly-come-closer/2006/02/17/1140151818765.html
  • http://www.biog1105-1106.org/demos/105/unit8/ovaryplacenta.html
  • http://stages-of-pregnancy-development.com/pregnancy-week-13/