Jessica is pregnant, and she is concerned about neural tube defects that may occur in the embryonic period. Explain to Jessica what can happen during this period of development if the neural tube does not develop properly.
What will be an ideal response?
The ideal answer should include:
1. There are many possible things that can happen when there are neural tube defects during the embryonic period. The primary difference in possible outcomes concerns the location at which the neural tube fails to close (i.e., at the top, middle, or bottom).
2. The neural tube forms in the first two weeks of the embryonic period.
3. The neural tube closes on about the 26th to 28th day of pregnancy.
4. If it fails to close in the middle, a neural tube defect may occur along the spine (spina bifida).
5. If it fails to close at the top end, a fatal condition known as anencephaly (lack of a brain) occurs.
6. One factor that increases the risk of neural tube defects is a lack of folic acid in the mother's diet, so Jessica should try to get an adequate supply of folic acid in her diet.
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